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[tor-commits] [tor-browser/tor-browser-91.4.0esr-11.0-1] Bug 30237: Add v3 onion services client authentication prompt



commit 1b9ab13bf6f22453925263676ac4091072165a4a
Author: Kathy Brade <brade@xxxxxxxxxxxxxxxxx>
Date:   Tue Nov 12 16:11:05 2019 -0500

    Bug 30237: Add v3 onion services client authentication prompt
    
    When Tor informs the browser that client authentication is needed,
    temporarily load about:blank instead of about:neterror and prompt
    for the user's key.
    
    If a correctly formatted key is entered, use Tor's ONION_CLIENT_AUTH_ADD
    control port command to add the key (via Torbutton's control port
    module) and reload the page.
    
    If the user cancels the prompt, display the standard about:neterror
    "Unable to connect" page. This requires a small change to
    browser/actors/NetErrorChild.jsm to account for the fact that the
    docShell no longer has the failedChannel information. The failedChannel
    is used to extract TLS-related error info, which is not applicable
    in the case of a canceled .onion authentication prompt.
    
    Add a leaveOpen option to PopupNotifications.show so we can display
    error messages within the popup notification doorhanger without
    closing the prompt.
    
    Add support for onion services strings to the TorStrings module.
    
    Add support for Tor extended SOCKS errors (Tor proposal 304) to the
    socket transport and SOCKS layers. Improved display of all of these
    errors will be implemented as part of bug 30025.
    
    Also fixes bug 19757:
     Add a "Remember this key" checkbox to the client auth prompt.
    
     Add an "Onion Services Authentication" section within the
     about:preferences "Privacy & Security section" to allow
     viewing and removal of v3 onion client auth keys that have
     been stored on disk.
    
    Also fixes bug 19251: use enhanced error pages for onion service errors.
---
 browser/actors/NetErrorChild.jsm                   |   7 +
 browser/base/content/browser.js                    |  10 +
 browser/base/content/browser.xhtml                 |   1 +
 browser/base/content/certerror/aboutNetError.js    |  10 +-
 browser/base/content/certerror/aboutNetError.xhtml |   1 +
 browser/base/content/main-popupset.inc.xhtml       |   1 +
 browser/base/content/navigator-toolbox.inc.xhtml   |   1 +
 browser/base/content/tab-content.js                |   6 +
 browser/components/moz.build                       |   1 +
 .../content/authNotificationIcon.inc.xhtml         |   6 +
 .../onionservices/content/authPopup.inc.xhtml      |  16 ++
 .../onionservices/content/authPreferences.css      |  20 ++
 .../content/authPreferences.inc.xhtml              |  19 ++
 .../onionservices/content/authPreferences.js       |  66 +++++
 .../components/onionservices/content/authPrompt.js | 316 +++++++++++++++++++++
 .../components/onionservices/content/authUtil.jsm  |  47 +++
 .../onionservices/content/netError/browser.svg     |   3 +
 .../onionservices/content/netError/network.svg     |   3 +
 .../content/netError/onionNetError.css             |  88 ++++++
 .../content/netError/onionNetError.js              | 243 ++++++++++++++++
 .../onionservices/content/netError/onionsite.svg   |   8 +
 .../onionservices/content/onionservices.css        |  69 +++++
 .../onionservices/content/savedKeysDialog.js       | 259 +++++++++++++++++
 .../onionservices/content/savedKeysDialog.xhtml    |  42 +++
 browser/components/onionservices/jar.mn            |   9 +
 browser/components/onionservices/moz.build         |   1 +
 browser/components/preferences/preferences.xhtml   |   1 +
 browser/components/preferences/privacy.inc.xhtml   |   2 +
 browser/components/preferences/privacy.js          |   7 +
 browser/themes/shared/notification-icons.inc.css   |   3 +
 docshell/base/nsDocShell.cpp                       |  81 +++++-
 dom/ipc/BrowserParent.cpp                          |  21 ++
 dom/ipc/BrowserParent.h                            |   3 +
 dom/ipc/PBrowser.ipdl                              |   9 +
 js/xpconnect/src/xpc.msg                           |  10 +
 netwerk/base/nsSocketTransport2.cpp                |   6 +
 netwerk/socket/nsSOCKSIOLayer.cpp                  |  49 ++++
 toolkit/modules/PopupNotifications.jsm             |   6 +
 toolkit/modules/RemotePageAccessManager.jsm        |   1 +
 .../lib/environments/frame-script.js               |   1 +
 xpcom/base/ErrorList.py                            |  22 ++
 41 files changed, 1473 insertions(+), 2 deletions(-)

diff --git a/browser/actors/NetErrorChild.jsm b/browser/actors/NetErrorChild.jsm
index 82978412fe24..164fb7c95cd1 100644
--- a/browser/actors/NetErrorChild.jsm
+++ b/browser/actors/NetErrorChild.jsm
@@ -13,6 +13,8 @@ const { RemotePageChild } = ChromeUtils.import(
   "resource://gre/actors/RemotePageChild.jsm"
 );
 
+const { TorStrings } = ChromeUtils.import("resource:///modules/TorStrings.jsm");
+
 XPCOMUtils.defineLazyServiceGetter(
   this,
   "gSerializationHelper",
@@ -33,6 +35,7 @@ class NetErrorChild extends RemotePageChild {
       "RPMAddToHistogram",
       "RPMRecordTelemetryEvent",
       "RPMGetHttpResponseHeader",
+      "RPMGetTorStrings",
     ];
     this.exportFunctions(exportableFunctions);
   }
@@ -115,4 +118,8 @@ class NetErrorChild extends RemotePageChild {
 
     return "";
   }
+
+  RPMGetTorStrings() {
+    return Cu.cloneInto(TorStrings.onionServices, this.contentWindow);
+  }
 }
diff --git a/browser/base/content/browser.js b/browser/base/content/browser.js
index b121ee301ee7..f33442c4badc 100644
--- a/browser/base/content/browser.js
+++ b/browser/base/content/browser.js
@@ -229,6 +229,11 @@ XPCOMUtils.defineLazyScriptGetter(
   ["SecurityLevelButton"],
   "chrome://browser/content/securitylevel/securityLevel.js"
 );
+XPCOMUtils.defineLazyScriptGetter(
+  this,
+  ["OnionAuthPrompt"],
+  "chrome://browser/content/onionservices/authPrompt.js"
+);
 XPCOMUtils.defineLazyScriptGetter(
   this,
   "gEditItemOverlay",
@@ -1777,6 +1782,9 @@ var gBrowserInit = {
     // Init the SecuritySettingsButton
     SecurityLevelButton.init();
 
+    // Init the OnionAuthPrompt
+    OnionAuthPrompt.init();
+
     // Certain kinds of automigration rely on this notification to complete
     // their tasks BEFORE the browser window is shown. SessionStore uses it to
     // restore tabs into windows AFTER important parts like gMultiProcessBrowser
@@ -2494,6 +2502,8 @@ var gBrowserInit = {
 
     SecurityLevelButton.uninit();
 
+    OnionAuthPrompt.uninit();
+
     gAccessibilityServiceIndicator.uninit();
 
     if (gToolbarKeyNavEnabled) {
diff --git a/browser/base/content/browser.xhtml b/browser/base/content/browser.xhtml
index 8fbfa05196b0..65445a099148 100644
--- a/browser/base/content/browser.xhtml
+++ b/browser/base/content/browser.xhtml
@@ -33,6 +33,7 @@
 <?xml-stylesheet href="chrome://browser/skin/places/editBookmark.css" type="text/css"?>
 <?xml-stylesheet href="chrome://torbutton/skin/tor-circuit-display.css" type="text/css"?>
 <?xml-stylesheet href="chrome://torbutton/skin/torbutton.css" type="text/css"?>
+<?xml-stylesheet href="chrome://browser/content/onionservices/onionservices.css" type="text/css"?>
 
 # All DTD information is stored in a separate file so that it can be shared by
 # hiddenWindowMac.xhtml.
diff --git a/browser/base/content/certerror/aboutNetError.js b/browser/base/content/certerror/aboutNetError.js
index 31c4838a053d..e5b223025a8b 100644
--- a/browser/base/content/certerror/aboutNetError.js
+++ b/browser/base/content/certerror/aboutNetError.js
@@ -3,6 +3,7 @@
  * You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 /* eslint-env mozilla/frame-script */
+/* import-globals-from ../../components/onionservices/content/netError/onionNetError.js */
 
 import "chrome://global/content/certviewer/pvutils_bundle.js";
 import "chrome://global/content/certviewer/asn1js_bundle.js";
@@ -307,7 +308,10 @@ function initPage() {
     errDesc = document.getElementById("ed_generic");
   }
 
-  setErrorPageStrings(err);
+  const isOnionError = err.startsWith("onionServices.");
+  if (!isOnionError) {
+    setErrorPageStrings(err);
+  }
 
   var sd = document.getElementById("errorShortDescText");
   if (sd) {
@@ -459,6 +463,10 @@ function initPage() {
       span.textContent = HOST_NAME;
     }
   }
+
+  if (isOnionError) {
+    OnionServicesAboutNetError.initPage(document);
+  }
 }
 
 function setupBlockingReportingUI() {
diff --git a/browser/base/content/certerror/aboutNetError.xhtml b/browser/base/content/certerror/aboutNetError.xhtml
index c645a2f2cc77..bf9a8fd58347 100644
--- a/browser/base/content/certerror/aboutNetError.xhtml
+++ b/browser/base/content/certerror/aboutNetError.xhtml
@@ -209,5 +209,6 @@
     </div>
   </body>
   <script src="chrome://browser/content/certerror/aboutNetErrorCodes.js"/>
+  <script src="chrome://browser/content/onionservices/netError/onionNetError.js"/>
   <script type="module" src="chrome://browser/content/certerror/aboutNetError.js"/>
 </html>
diff --git a/browser/base/content/main-popupset.inc.xhtml b/browser/base/content/main-popupset.inc.xhtml
index adf0a4f59e4b..f627b97cba3f 100644
--- a/browser/base/content/main-popupset.inc.xhtml
+++ b/browser/base/content/main-popupset.inc.xhtml
@@ -520,6 +520,7 @@
 #include ../../components/downloads/content/downloadsPanel.inc.xhtml
 #include ../../../devtools/startup/enableDevToolsPopup.inc.xhtml
 #include ../../components/securitylevel/content/securityLevelPanel.inc.xhtml
+#include ../../components/onionservices/content/authPopup.inc.xhtml
 #include browser-allTabsMenu.inc.xhtml
 
   <tooltip id="dynamic-shortcut-tooltip"
diff --git a/browser/base/content/navigator-toolbox.inc.xhtml b/browser/base/content/navigator-toolbox.inc.xhtml
index 7359cec49696..7a2715e9e604 100644
--- a/browser/base/content/navigator-toolbox.inc.xhtml
+++ b/browser/base/content/navigator-toolbox.inc.xhtml
@@ -268,6 +268,7 @@
                        data-l10n-id="urlbar-indexed-db-notification-anchor"/>
                 <image id="password-notification-icon" class="notification-anchor-icon login-icon" role="button"
                        data-l10n-id="urlbar-password-notification-anchor"/>
+#include ../../components/onionservices/content/authNotificationIcon.inc.xhtml
                 <stack id="plugins-notification-icon" class="notification-anchor-icon" role="button" align="center" data-l10n-id="urlbar-plugins-notification-anchor">
                   <image class="plugin-icon" />
                   <image id="plugin-icon-badge" />
diff --git a/browser/base/content/tab-content.js b/browser/base/content/tab-content.js
index 83e55cf5ed87..96360a4307d2 100644
--- a/browser/base/content/tab-content.js
+++ b/browser/base/content/tab-content.js
@@ -7,4 +7,10 @@
 
 var { Services } = ChromeUtils.import("resource://gre/modules/Services.jsm");
 
+var { OnionAuthUtil } = ChromeUtils.import(
+  "chrome://browser/content/onionservices/authUtil.jsm"
+);
+
 Services.obs.notifyObservers(this, "tab-content-frameloader-created");
+
+OnionAuthUtil.addCancelMessageListener(this, docShell);
diff --git a/browser/components/moz.build b/browser/components/moz.build
index b409974a965c..0ea2969e60b0 100644
--- a/browser/components/moz.build
+++ b/browser/components/moz.build
@@ -38,6 +38,7 @@ DIRS += [
     "extensions",
     "migration",
     "newtab",
+    "onionservices",
     "originattributes",
     "ion",
     "places",
diff --git a/browser/components/onionservices/content/authNotificationIcon.inc.xhtml b/browser/components/onionservices/content/authNotificationIcon.inc.xhtml
new file mode 100644
index 000000000000..91274d612739
--- /dev/null
+++ b/browser/components/onionservices/content/authNotificationIcon.inc.xhtml
@@ -0,0 +1,6 @@
+# Copyright (c) 2020, The Tor Project, Inc.
+
+<image id="tor-clientauth-notification-icon"
+       class="notification-anchor-icon tor-clientauth-icon"
+       role="button"
+       tooltiptext="&torbutton.onionServices.authPrompt.tooltip;"/>
diff --git a/browser/components/onionservices/content/authPopup.inc.xhtml b/browser/components/onionservices/content/authPopup.inc.xhtml
new file mode 100644
index 000000000000..bd0ec3aa0b00
--- /dev/null
+++ b/browser/components/onionservices/content/authPopup.inc.xhtml
@@ -0,0 +1,16 @@
+# Copyright (c) 2020, The Tor Project, Inc.
+
+<popupnotification id="tor-clientauth-notification" hidden="true">
+  <popupnotificationcontent orient="vertical">
+    <description id="tor-clientauth-notification-desc"/>
+    <label id="tor-clientauth-notification-learnmore"
+           class="text-link popup-notification-learnmore-link"
+           is="text-link"/>
+    <html:div>
+      <html:input id="tor-clientauth-notification-key" type="password"/>
+      <html:div id="tor-clientauth-warning"/>
+      <checkbox id="tor-clientauth-persistkey-checkbox"
+                label="&torbutton.onionServices.authPrompt.persistCheckboxLabel;"/>
+    </html:div>
+  </popupnotificationcontent>
+</popupnotification>
diff --git a/browser/components/onionservices/content/authPreferences.css b/browser/components/onionservices/content/authPreferences.css
new file mode 100644
index 000000000000..b3fb79b26ddc
--- /dev/null
+++ b/browser/components/onionservices/content/authPreferences.css
@@ -0,0 +1,20 @@
+/* Copyright (c) 2020, The Tor Project, Inc. */
+
+#torOnionServiceKeys-overview-container {
+  margin-right: 30px;
+}
+
+#onionservices-savedkeys-tree treechildren::-moz-tree-cell-text {
+  font-size: 80%;
+}
+
+#onionservices-savedkeys-errorContainer {
+  margin-top: 4px;
+  min-height: 3em;
+}
+
+#onionservices-savedkeys-errorIcon {
+  margin-right: 4px;
+  list-style-image: url("chrome://browser/skin/warning.svg");
+  visibility: hidden;
+}
diff --git a/browser/components/onionservices/content/authPreferences.inc.xhtml b/browser/components/onionservices/content/authPreferences.inc.xhtml
new file mode 100644
index 000000000000..f69c9dde66a2
--- /dev/null
+++ b/browser/components/onionservices/content/authPreferences.inc.xhtml
@@ -0,0 +1,19 @@
+# Copyright (c) 2020, The Tor Project, Inc.
+
+<groupbox id="torOnionServiceKeys" orient="vertical"
+          data-category="panePrivacy" hidden="true">
+  <label><html:h2 id="torOnionServiceKeys-header"/></label>
+  <hbox>
+    <description id="torOnionServiceKeys-overview-container" flex="1">
+      <html:span id="torOnionServiceKeys-overview"
+                 class="tail-with-learn-more"/>
+      <label id="torOnionServiceKeys-learnMore" class="learnMore text-link"
+             is="text-link"/>
+    </description>
+    <vbox align="end">
+      <button id="torOnionServiceKeys-savedKeys"
+              is="highlightable-button"
+              class="accessory-button"/>
+    </vbox>
+  </hbox>
+</groupbox>
diff --git a/browser/components/onionservices/content/authPreferences.js b/browser/components/onionservices/content/authPreferences.js
new file mode 100644
index 000000000000..52f8272020cc
--- /dev/null
+++ b/browser/components/onionservices/content/authPreferences.js
@@ -0,0 +1,66 @@
+// Copyright (c) 2020, The Tor Project, Inc.
+
+"use strict";
+
+ChromeUtils.defineModuleGetter(
+  this,
+  "TorStrings",
+  "resource:///modules/TorStrings.jsm"
+);
+
+/*
+  Onion Services Client Authentication Preferences Code
+
+  Code to handle init and update of onion services authentication section
+  in about:preferences#privacy
+*/
+
+const OnionServicesAuthPreferences = {
+  selector: {
+    groupBox: "#torOnionServiceKeys",
+    header: "#torOnionServiceKeys-header",
+    overview: "#torOnionServiceKeys-overview",
+    learnMore: "#torOnionServiceKeys-learnMore",
+    savedKeysButton: "#torOnionServiceKeys-savedKeys",
+  },
+
+  init() {
+    // populate XUL with localized strings
+    this._populateXUL();
+  },
+
+  _populateXUL() {
+    const groupbox = document.querySelector(this.selector.groupBox);
+
+    let elem = groupbox.querySelector(this.selector.header);
+    elem.textContent = TorStrings.onionServices.authPreferences.header;
+
+    elem = groupbox.querySelector(this.selector.overview);
+    elem.textContent = TorStrings.onionServices.authPreferences.overview;
+
+    elem = groupbox.querySelector(this.selector.learnMore);
+    elem.setAttribute("value", TorStrings.onionServices.learnMore);
+    elem.setAttribute("href", TorStrings.onionServices.learnMoreURL);
+
+    elem = groupbox.querySelector(this.selector.savedKeysButton);
+    elem.setAttribute(
+      "label",
+      TorStrings.onionServices.authPreferences.savedKeys
+    );
+    elem.addEventListener("command", () =>
+      OnionServicesAuthPreferences.onViewSavedKeys()
+    );
+  },
+
+  onViewSavedKeys() {
+    gSubDialog.open(
+      "chrome://browser/content/onionservices/savedKeysDialog.xhtml"
+    );
+  },
+}; // OnionServicesAuthPreferences
+
+Object.defineProperty(this, "OnionServicesAuthPreferences", {
+  value: OnionServicesAuthPreferences,
+  enumerable: true,
+  writable: false,
+});
diff --git a/browser/components/onionservices/content/authPrompt.js b/browser/components/onionservices/content/authPrompt.js
new file mode 100644
index 000000000000..d4a59ac46487
--- /dev/null
+++ b/browser/components/onionservices/content/authPrompt.js
@@ -0,0 +1,316 @@
+// Copyright (c) 2020, The Tor Project, Inc.
+
+"use strict";
+
+XPCOMUtils.defineLazyModuleGetters(this, {
+  OnionAuthUtil: "chrome://browser/content/onionservices/authUtil.jsm",
+  CommonUtils: "resource://services-common/utils.js",
+  TorStrings: "resource:///modules/TorStrings.jsm",
+});
+
+const OnionAuthPrompt = (function() {
+  // OnionServicesAuthPrompt objects run within the main/chrome process.
+  // aReason is the topic passed within the observer notification that is
+  // causing this auth prompt to be displayed.
+  function OnionServicesAuthPrompt(aBrowser, aFailedURI, aReason, aOnionName) {
+    this._browser = aBrowser;
+    this._failedURI = aFailedURI;
+    this._reasonForPrompt = aReason;
+    this._onionName = aOnionName;
+  }
+
+  OnionServicesAuthPrompt.prototype = {
+    show(aWarningMessage) {
+      let mainAction = {
+        label: TorStrings.onionServices.authPrompt.done,
+        accessKey: TorStrings.onionServices.authPrompt.doneAccessKey,
+        leaveOpen: true, // Callback is responsible for closing the notification.
+        callback: this._onDone.bind(this),
+      };
+
+      let dialogBundle = Services.strings.createBundle(
+                           "chrome://global/locale/dialog.properties");
+
+      let cancelAccessKey = dialogBundle.GetStringFromName("accesskey-cancel");
+      if (!cancelAccessKey)
+        cancelAccessKey = "c"; // required by PopupNotifications.show()
+
+      let cancelAction = {
+        label: dialogBundle.GetStringFromName("button-cancel"),
+        accessKey: cancelAccessKey,
+        callback: this._onCancel.bind(this),
+      };
+
+      let _this = this;
+      let options = {
+        autofocus: true,
+        hideClose: true,
+        persistent: true,
+        removeOnDismissal: false,
+        eventCallback(aTopic) {
+          if (aTopic === "showing") {
+            _this._onPromptShowing(aWarningMessage);
+          } else if (aTopic === "shown") {
+            _this._onPromptShown();
+          } else if (aTopic === "removed") {
+            _this._onPromptRemoved();
+          }
+        }
+      };
+
+      this._prompt = PopupNotifications.show(this._browser,
+                       OnionAuthUtil.domid.notification, "",
+                       OnionAuthUtil.domid.anchor,
+                       mainAction, [cancelAction], options);
+    },
+
+    _onPromptShowing(aWarningMessage) {
+      let xulDoc = this._browser.ownerDocument;
+      let descElem = xulDoc.getElementById(OnionAuthUtil.domid.description);
+      if (descElem) {
+        // Handle replacement of the onion name within the localized
+        // string ourselves so we can show the onion name as bold text.
+        // We do this by splitting the localized string and creating
+        // several HTML <span> elements.
+        while (descElem.firstChild)
+          descElem.removeChild(descElem.firstChild);
+
+        let fmtString = TorStrings.onionServices.authPrompt.description;
+        let prefix = "";
+        let suffix = "";
+        const kToReplace = "%S";
+        let idx = fmtString.indexOf(kToReplace);
+        if (idx < 0) {
+          prefix = fmtString;
+        } else {
+          prefix = fmtString.substring(0, idx);
+          suffix = fmtString.substring(idx + kToReplace.length);
+        }
+
+        const kHTMLNS = "http://www.w3.org/1999/xhtml";;
+        let span = xulDoc.createElementNS(kHTMLNS, "span");
+        span.textContent = prefix;
+        descElem.appendChild(span);
+        span = xulDoc.createElementNS(kHTMLNS, "span");
+        span.id = OnionAuthUtil.domid.onionNameSpan;
+        span.textContent = this._onionName;
+        descElem.appendChild(span);
+        span = xulDoc.createElementNS(kHTMLNS, "span");
+        span.textContent = suffix;
+        descElem.appendChild(span);
+      }
+
+      // Set "Learn More" label and href.
+      let learnMoreElem = xulDoc.getElementById(OnionAuthUtil.domid.learnMore);
+      if (learnMoreElem) {
+        learnMoreElem.setAttribute("value", TorStrings.onionServices.learnMore);
+        learnMoreElem.setAttribute("href", TorStrings.onionServices.learnMoreURL);
+      }
+
+      this._showWarning(aWarningMessage);
+      let checkboxElem = this._getCheckboxElement();
+      if (checkboxElem) {
+        checkboxElem.checked = false;
+      }
+    },
+
+    _onPromptShown() {
+      let keyElem = this._getKeyElement();
+      if (keyElem) {
+        keyElem.setAttribute("placeholder",
+                          TorStrings.onionServices.authPrompt.keyPlaceholder);
+        this._boundOnKeyFieldKeyPress = this._onKeyFieldKeyPress.bind(this);
+        this._boundOnKeyFieldInput = this._onKeyFieldInput.bind(this);
+        keyElem.addEventListener("keypress", this._boundOnKeyFieldKeyPress);
+        keyElem.addEventListener("input", this._boundOnKeyFieldInput);
+        keyElem.focus();
+      }
+    },
+
+    _onPromptRemoved() {
+      if (this._boundOnKeyFieldKeyPress) {
+        let keyElem = this._getKeyElement();
+        if (keyElem) {
+          keyElem.value = "";
+          keyElem.removeEventListener("keypress",
+                                      this._boundOnKeyFieldKeyPress);
+          this._boundOnKeyFieldKeyPress = undefined;
+          keyElem.removeEventListener("input", this._boundOnKeyFieldInput);
+          this._boundOnKeyFieldInput = undefined;
+        }
+      }
+    },
+
+    _onKeyFieldKeyPress(aEvent) {
+      if (aEvent.keyCode == aEvent.DOM_VK_RETURN) {
+        this._onDone();
+      } else if (aEvent.keyCode == aEvent.DOM_VK_ESCAPE) {
+        this._prompt.remove();
+        this._onCancel();
+      }
+    },
+
+    _onKeyFieldInput(aEvent) {
+      this._showWarning(undefined); // Remove the warning.
+    },
+
+    _onDone() {
+      let keyElem = this._getKeyElement();
+      if (!keyElem)
+        return;
+
+      let base64key = this._keyToBase64(keyElem.value);
+      if (!base64key) {
+        this._showWarning(TorStrings.onionServices.authPrompt.invalidKey);
+        return;
+      }
+
+      this._prompt.remove();
+
+      // Use Torbutton's controller module to add the private key to Tor.
+      let controllerFailureMsg =
+        TorStrings.onionServices.authPrompt.failedToSetKey;
+      try {
+        let { controller } =
+            Cu.import("resource://torbutton/modules/tor-control-port.js", {});
+        let torController = controller(aError => {
+          this.show(controllerFailureMsg);
+        });
+        let onionAddr = this._onionName.toLowerCase().replace(/\.onion$/, "");
+        let checkboxElem = this._getCheckboxElement();
+        let isPermanent = (checkboxElem && checkboxElem.checked);
+        torController.onionAuthAdd(onionAddr, base64key, isPermanent)
+        .then(aResponse => {
+          // Success! Reload the page.
+          this._browser.sendMessageToActor(
+            "Browser:Reload",
+            {},
+            "BrowserTab"
+          );
+        })
+        .catch(aError => {
+          if (aError.torMessage)
+            this.show(aError.torMessage);
+          else
+            this.show(controllerFailureMsg);
+        });
+      } catch (e) {
+        this.show(controllerFailureMsg);
+      }
+    },
+
+    _onCancel() {
+      // Arrange for an error page to be displayed.
+      this._browser.messageManager.sendAsyncMessage(
+                               OnionAuthUtil.message.authPromptCanceled,
+                               {failedURI: this._failedURI.spec,
+                                reasonForPrompt: this._reasonForPrompt});
+    },
+
+    _getKeyElement() {
+      let xulDoc = this._browser.ownerDocument;
+      return xulDoc.getElementById(OnionAuthUtil.domid.keyElement);
+    },
+
+    _getCheckboxElement() {
+      let xulDoc = this._browser.ownerDocument;
+      return xulDoc.getElementById(OnionAuthUtil.domid.checkboxElement);
+    },
+
+    _showWarning(aWarningMessage) {
+      let xulDoc = this._browser.ownerDocument;
+      let warningElem =
+                 xulDoc.getElementById(OnionAuthUtil.domid.warningElement);
+      let keyElem = this._getKeyElement();
+      if (warningElem) {
+        if (aWarningMessage) {
+          warningElem.textContent = aWarningMessage;
+          warningElem.removeAttribute("hidden");
+          if (keyElem)
+            keyElem.className = "invalid";
+        } else {
+          warningElem.setAttribute("hidden", "true");
+          if (keyElem)
+            keyElem.className = "";
+        }
+      }
+    },
+
+    // Returns undefined if the key is the wrong length or format.
+    _keyToBase64(aKeyString) {
+      if (!aKeyString)
+        return undefined;
+
+      let base64key;
+      if (aKeyString.length == 52) {
+        // The key is probably base32-encoded. Attempt to decode.
+        // Although base32 specifies uppercase letters, we accept lowercase
+        // as well because users may type in lowercase or copy a key out of
+        // a tor onion-auth file (which uses lowercase).
+        let rawKey;
+        try {
+          rawKey = CommonUtils.decodeBase32(aKeyString.toUpperCase());
+        } catch (e) {}
+
+        if (rawKey) try {
+          base64key = btoa(rawKey);
+        } catch (e) {}
+      } else if ((aKeyString.length == 44) &&
+                 /^[a-zA-Z0-9+/]*=*$/.test(aKeyString)) {
+        // The key appears to be a correctly formatted base64 value. If not,
+        // tor will return an error when we try to add the key via the
+        // control port.
+        base64key = aKeyString;
+      }
+
+      return base64key;
+    },
+  };
+
+  let retval = {
+    init() {
+      Services.obs.addObserver(this, OnionAuthUtil.topic.clientAuthMissing);
+      Services.obs.addObserver(this, OnionAuthUtil.topic.clientAuthIncorrect);
+    },
+
+    uninit() {
+      Services.obs.removeObserver(this, OnionAuthUtil.topic.clientAuthMissing);
+      Services.obs.removeObserver(this, OnionAuthUtil.topic.clientAuthIncorrect);
+    },
+
+    // aSubject is the DOM Window or browser where the prompt should be shown.
+    // aData contains the .onion name.
+    observe(aSubject, aTopic, aData) {
+      if ((aTopic != OnionAuthUtil.topic.clientAuthMissing) &&
+          (aTopic != OnionAuthUtil.topic.clientAuthIncorrect)) {
+        return;
+      }
+
+      let browser;
+      if (aSubject instanceof Ci.nsIDOMWindow) {
+        let contentWindow = aSubject.QueryInterface(Ci.nsIDOMWindow);
+        browser = contentWindow.docShell.chromeEventHandler;
+      } else {
+        browser = aSubject.QueryInterface(Ci.nsIBrowser);
+      }
+
+      if (!gBrowser.browsers.some(aBrowser => aBrowser == browser)) {
+        return; // This window does not contain the subject browser; ignore.
+      }
+
+      let failedURI = browser.currentURI;
+      let authPrompt = new OnionServicesAuthPrompt(browser, failedURI,
+                                                   aTopic, aData);
+      authPrompt.show(undefined);
+    }
+  };
+
+  return retval;
+})(); /* OnionAuthPrompt */
+
+
+Object.defineProperty(this, "OnionAuthPrompt", {
+  value: OnionAuthPrompt,
+  enumerable: true,
+  writable: false
+});
diff --git a/browser/components/onionservices/content/authUtil.jsm b/browser/components/onionservices/content/authUtil.jsm
new file mode 100644
index 000000000000..c9d83774da1f
--- /dev/null
+++ b/browser/components/onionservices/content/authUtil.jsm
@@ -0,0 +1,47 @@
+// Copyright (c) 2020, The Tor Project, Inc.
+
+"use strict";
+
+var EXPORTED_SYMBOLS = [
+  "OnionAuthUtil",
+];
+
+var { Services } = ChromeUtils.import("resource://gre/modules/Services.jsm");
+
+const OnionAuthUtil = {
+  topic: {
+    clientAuthMissing: "tor-onion-services-clientauth-missing",
+    clientAuthIncorrect: "tor-onion-services-clientauth-incorrect",
+  },
+  message: {
+    authPromptCanceled: "Tor:OnionServicesAuthPromptCanceled",
+  },
+  domid: {
+    anchor: "tor-clientauth-notification-icon",
+    notification: "tor-clientauth",
+    description: "tor-clientauth-notification-desc",
+    learnMore: "tor-clientauth-notification-learnmore",
+    onionNameSpan: "tor-clientauth-notification-onionname",
+    keyElement: "tor-clientauth-notification-key",
+    warningElement: "tor-clientauth-warning",
+    checkboxElement: "tor-clientauth-persistkey-checkbox",
+  },
+
+  addCancelMessageListener(aTabContent, aDocShell) {
+    aTabContent.addMessageListener(this.message.authPromptCanceled,
+                                   (aMessage) => {
+      // Upon cancellation of the client authentication prompt, display
+      // the appropriate error page. When calling the docShell
+      // displayLoadError() function, we pass undefined for the failed
+      // channel so that displayLoadError() can determine that it should
+      // not display the client authentication prompt a second time.
+      let failedURI = Services.io.newURI(aMessage.data.failedURI);
+      let reasonForPrompt = aMessage.data.reasonForPrompt;
+      let errorCode =
+          (reasonForPrompt === this.topic.clientAuthMissing) ?
+          Cr.NS_ERROR_TOR_ONION_SVC_MISSING_CLIENT_AUTH :
+          Cr.NS_ERROR_TOR_ONION_SVC_BAD_CLIENT_AUTH;
+      aDocShell.displayLoadError(errorCode, failedURI, undefined, undefined);
+    });
+  },
+};
diff --git a/browser/components/onionservices/content/netError/browser.svg b/browser/components/onionservices/content/netError/browser.svg
new file mode 100644
index 000000000000..1359679f7171
--- /dev/null
+++ b/browser/components/onionservices/content/netError/browser.svg
@@ -0,0 +1,3 @@
+<svg fill="none" height="60" viewBox="0 0 60 60" width="60" xmlns="http://www.w3.org/2000/svg";>
+  <path fill="context-fill" fill-opacity="context-fill-opacity" d="m49 6h-37.5c-1.98912 0-3.89678.79018-5.3033 2.1967s-2.1967 3.3142-2.1967 5.3033v33.75c0 1.9891.79018 3.8968 2.1967 5.3033s3.31418 2.1967 5.3033 2.1967h37.5c1.9891 0 3.8968-.7902 5.3033-2.1967s2.1967-3.3142 2.1967-5.3033v-33.75c0-1.9891-.7902-3.89678-2.1967-5.3033s-3.3142-2.1967-5.3033-2.1967zm-38.0625 4.6875h38.625l2.25 2.25v8.0625h-43.125v-8.0625zm38.625 39.375h-38.625l-2.25-2.25v-22.125h43.125v22.125z"/>
+</svg>
diff --git a/browser/components/onionservices/content/netError/network.svg b/browser/components/onionservices/content/netError/network.svg
new file mode 100644
index 000000000000..68610e30bfca
--- /dev/null
+++ b/browser/components/onionservices/content/netError/network.svg
@@ -0,0 +1,3 @@
+<svg fill="none" height="60" viewBox="0 0 60 60" width="60" xmlns="http://www.w3.org/2000/svg";>
+  <path fill="context-fill" fill-opacity="context-fill-opacity" d="m30 1.875c-7.4592 0-14.6129 2.96316-19.8874 8.2376-5.27444 5.2745-8.2376 12.4282-8.2376 19.8874s2.96316 14.6129 8.2376 19.8874c5.2745 5.2744 12.4282 8.2376 19.8874 8.2376s14.6129-2.9632 19.8874-8.2376c5.2744-5.2745 8.2376-12.4282 8.2376-19.8874s-2.9632-14.6129-8.2376-19.8874c-5.2745-5.27444-12.4282-8.2376-19.8874-8.2376zm9.1762 6.5625c3.8504 1.6533 7.1876 4.3079 9.6646 7.6877 2.477 3.3799 4.0034 7.3615 4.4205 11.531h-8.3588c-.4617-6.9829-2.9858-13.6716-7.2525-19.2187zm-7.6837 0c5.0739 5.1814 8.1562 11.9874 8.7037 19.2187h-20.3924c.5475-7.2313 3.6298-14.0373 8.7037-19.2187zm-10.6725 0h1.53c-4.2651 5.548-6.789 12.2362-7.2525 19.2187h-8.35875c.41632-4.1692 1.942-8.1508 4.41835-11.5306 2.4764-3.3799 5.813-6.0346 9.6629-7.6881zm0 43.125c-3.8504-1.6528-7.1874-4.3074-9.6639-7.6874-2.47642-3.38-4.0018-7.3619-4.41735-11.5313h8.35875c.4617 6.9829 2.9858 13.6716 7.2525 19.2187zm7.6875 0c-5.0739-5.1814-8.1562-11.9874-8.7037-19.2
 187h20.3887c-.5475 7.2313-3.6298 14.0373-8.7037 19.2187zm10.6725 0h-1.5338c4.2683-5.5462 6.7926-12.2354 7.2525-19.2187h8.3588c-.4156 4.1689-1.9406 8.1504-4.4163 11.5302-2.4757 3.3799-5.8118 6.0348-9.6612 7.6885z"/>
+</svg>
diff --git a/browser/components/onionservices/content/netError/onionNetError.css b/browser/components/onionservices/content/netError/onionNetError.css
new file mode 100644
index 000000000000..2c92b187b71c
--- /dev/null
+++ b/browser/components/onionservices/content/netError/onionNetError.css
@@ -0,0 +1,88 @@
+/* Copyright (c) 2020, The Tor Project, Inc. */
+
+#onionErrorDiagramContainer {
+  margin: 0px auto 40px 0px;
+  /* 3 icons 64px wide each seperated by a 64px gap */
+  width: 384px;
+  display: grid;
+  grid-row-gap: 15px;
+  grid-column-gap: 64px;
+  grid-template-columns: 1fr 1fr 1fr;
+}
+
+#onionErrorDiagramContainer > div {
+  margin: auto;
+  position: relative; /* needed to allow overlay of the ok or error icon */
+}
+
+.onionErrorImage {
+  width: 64px;
+  height: 64px;
+  background-size: 64px 64px;
+  background-position: center;
+  background-repeat: no-repeat;
+  -moz-context-properties: fill;
+  fill: var(--in-content-icon-color);
+  opacity: 50%;
+}
+
+/* TODO: remove these --warning-color definitions after we
+   are esr92 based (tor-browser#40640 */
+.onionErrorImage {
+  --warning-color: #ffa436;
+}
+
+@media (-moz-toolbar-prefers-color-scheme: dark)  {
+  .onionErrorImage {
+    --warning-color: #ffbd4f;
+  }
+}
+
+@media (prefers-contrast) {
+  .onionErrorImage {
+    --warning-color: var(--in-content-page-color);
+  }
+}
+
+.onionErrorImage[status] {
+  opacity: 100%;
+}
+
+#onionErrorBrowserImage {
+  background-image: url("browser.svg");
+}
+
+#onionErrorNetworkImage {
+  background-image: url("network.svg");
+}
+
+#onionErrorOnionSiteImage {
+  background-image: url("onionsite.svg");
+}
+
+/* rules to support overlay of the ok or error icon */
+.onionErrorImage[status]::after {
+  content: " ";
+  position: absolute;
+  left: -8px;
+  top: calc((64px - 24px) / 2);
+  width: 24px;
+  height: 24px;
+  -moz-context-properties: fill;
+  fill: var(--in-content-page-background);
+
+  background-repeat: no-repeat;
+  background-position: center;
+  border: 3px solid var(--in-content-page-background);
+  border-radius: 50%;
+}
+
+.onionErrorImage[status="ok"]::after {
+  background-color: var(--in-content-icon-color);
+  background-image: url("chrome://global/skin/icons/check.svg");
+}
+
+.onionErrorImage[status="error"]::after {
+  background-color: var(--warning-color);
+  background-image: url("chrome://global/skin/icons/close.svg");
+}
diff --git a/browser/components/onionservices/content/netError/onionNetError.js b/browser/components/onionservices/content/netError/onionNetError.js
new file mode 100644
index 000000000000..745c58ec6124
--- /dev/null
+++ b/browser/components/onionservices/content/netError/onionNetError.js
@@ -0,0 +1,243 @@
+// Copyright (c) 2020, The Tor Project, Inc.
+
+"use strict";
+
+/* eslint-env mozilla/frame-script */
+
+var OnionServicesAboutNetError = {
+  _selector: {
+    textContainer: "div#text-container",
+    header: ".title-text",
+    longDesc: "#errorLongDesc",
+    learnMoreContainer: "#learnMoreContainer",
+    learnMoreLink: "#learnMoreLink",
+    contentContainer: "#errorLongContent",
+    tryAgainButtonContainer: "#netErrorButtonContainer",
+  },
+  _status: {
+    ok: "ok",
+    error: "error",
+  },
+
+  _diagramInfoMap: undefined,
+
+  // Public functions (called from outside this file).
+  //
+  // This initPage() function may need to be updated if the structure of
+  // browser/base/content/aboutNetError.xhtml changes. Specifically, it
+  // references the following elements:
+  //   query string parameter e
+  //   class title-text
+  //   id errorLongDesc
+  //   id learnMoreContainer
+  //   id learnMoreLink
+  //   id errorLongContent
+  initPage(aDoc) {
+    const searchParams = new URLSearchParams(aDoc.documentURI.split("?")[1]);
+    const err = searchParams.get("e");
+
+    const errPrefix = "onionServices.";
+    const errName = err.substring(errPrefix.length);
+
+    this._strings = RPMGetTorStrings();
+
+    const stringsObj = this._strings[errName];
+    if (!stringsObj) {
+      return;
+    }
+
+    this._insertStylesheet(aDoc);
+
+    const pageTitle = stringsObj.pageTitle;
+    const header = stringsObj.header;
+    const longDescription = stringsObj.longDescription; // optional
+    const learnMoreURL = stringsObj.learnMoreURL;
+
+    if (pageTitle) {
+      aDoc.title = pageTitle;
+    }
+
+    if (header) {
+      const headerElem = aDoc.querySelector(this._selector.header);
+      if (headerElem) {
+        headerElem.textContent = header;
+      }
+    }
+
+    const ld = aDoc.querySelector(this._selector.longDesc);
+    if (ld) {
+      if (longDescription) {
+        const hexErr = this._hexErrorFromName(errName);
+        ld.textContent = longDescription.replace("%S", hexErr);
+      } else {
+        // This onion service error does not have a long description. Since
+        // it is set to a generic error string by the code in
+        // browser/base/content/aboutNetError.js, hide it here.
+        ld.style.display = "none";
+      }
+    }
+
+    if (learnMoreURL) {
+      const lmContainer = aDoc.querySelector(this._selector.learnMoreContainer);
+      if (lmContainer) {
+        lmContainer.style.display = "block";
+      }
+      const lmLink = lmContainer.querySelector(this._selector.learnMoreLink);
+      if (lmLink) {
+        lmLink.setAttribute("href", learnMoreURL);
+      }
+    }
+
+    // Remove the "Try Again" button if the user made a typo in the .onion
+    // address since it is not useful in that case.
+    if (errName === "badAddress") {
+      const tryAgainButton = aDoc.querySelector(
+        this._selector.tryAgainButtonContainer
+      );
+      if (tryAgainButton) {
+        tryAgainButton.style.display = "none";
+      }
+    }
+
+    this._insertDiagram(aDoc, errName);
+  }, // initPage()
+
+  _insertStylesheet(aDoc) {
+    const url =
+      "chrome://browser/content/onionservices/netError/onionNetError.css";
+    let linkElem = aDoc.createElement("link");
+    linkElem.rel = "stylesheet";
+    linkElem.href = url;
+    linkElem.type = "text/css";
+    aDoc.head.appendChild(linkElem);
+  },
+
+  _insertDiagram(aDoc, aErrorName) {
+    // The onion error diagram consists of a grid of div elements.
+    // The first row contains three images (Browser, Network, Onionsite) and
+    // the second row contains labels for the images that are in the first row.
+    // The _diagramInfoMap describes for each type of onion service error
+    // whether a small ok or error status icon is overlaid on top of the main
+    // Browser/Network/Onionsite images.
+    if (!this._diagramInfoMap) {
+      this._diagramInfoMap = new Map();
+      this._diagramInfoMap.set("descNotFound", {
+        browser: this._status.ok,
+        network: this._status.ok,
+        onionSite: this._status.error,
+      });
+      this._diagramInfoMap.set("descInvalid", {
+        browser: this._status.ok,
+        network: this._status.error,
+      });
+      this._diagramInfoMap.set("introFailed", {
+        browser: this._status.ok,
+        network: this._status.error,
+      });
+      this._diagramInfoMap.set("rendezvousFailed", {
+        browser: this._status.ok,
+        network: this._status.error,
+      });
+      this._diagramInfoMap.set("clientAuthMissing", {
+        browser: this._status.error,
+      });
+      this._diagramInfoMap.set("clientAuthIncorrect", {
+        browser: this._status.error,
+      });
+      this._diagramInfoMap.set("badAddress", {
+        browser: this._status.error,
+      });
+      this._diagramInfoMap.set("introTimedOut", {
+        browser: this._status.ok,
+        network: this._status.error,
+      });
+    }
+
+    const diagramInfo = this._diagramInfoMap.get(aErrorName);
+
+    const container = this._createDiv(aDoc, "onionErrorDiagramContainer");
+    const imageClass = "onionErrorImage";
+
+    const browserImage = this._createDiv(
+      aDoc,
+      "onionErrorBrowserImage",
+      imageClass,
+      container
+    );
+    if (diagramInfo && diagramInfo.browser) {
+      browserImage.setAttribute("status", diagramInfo.browser);
+    }
+
+    const networkImage = this._createDiv(
+      aDoc,
+      "onionErrorNetworkImage",
+      imageClass,
+      container
+    );
+    if (diagramInfo && diagramInfo.network) {
+      networkImage.setAttribute("status", diagramInfo.network);
+    }
+
+    const onionSiteImage = this._createDiv(
+      aDoc,
+      "onionErrorOnionSiteImage",
+      imageClass,
+      container
+    );
+    if (diagramInfo && diagramInfo.onionSite) {
+      onionSiteImage.setAttribute("status", diagramInfo.onionSite);
+    }
+
+    let labelDiv = this._createDiv(aDoc, undefined, undefined, container);
+    labelDiv.textContent = this._strings.errorPage.browser;
+    labelDiv = this._createDiv(aDoc, undefined, undefined, container);
+    labelDiv.textContent = this._strings.errorPage.network;
+    labelDiv = this._createDiv(aDoc, undefined, undefined, container);
+    labelDiv.textContent = this._strings.errorPage.onionSite;
+
+    const textContainer = aDoc.querySelector(
+      this._selector.textContainer
+    );
+    textContainer?.insertBefore(container, textContainer.firstChild);
+  }, // _insertDiagram()
+
+  _createDiv(aDoc, aID, aClass, aParentElem) {
+    const div = aDoc.createElement("div");
+    if (aID) {
+      div.id = aID;
+    }
+    if (aClass) {
+      div.setAttribute("class", aClass);
+    }
+    if (aParentElem) {
+      aParentElem.appendChild(div);
+    }
+
+    return div;
+  },
+
+  _hexErrorFromName(aErrorName) {
+    // We do not have access to the original Tor SOCKS error code here, so
+    // perform a reverse mapping from the error name.
+    switch (aErrorName) {
+      case "descNotFound":
+        return "0xF0";
+      case "descInvalid":
+        return "0xF1";
+      case "introFailed":
+        return "0xF2";
+      case "rendezvousFailed":
+        return "0xF3";
+      case "clientAuthMissing":
+        return "0xF4";
+      case "clientAuthIncorrect":
+        return "0xF5";
+      case "badAddress":
+        return "0xF6";
+      case "introTimedOut":
+        return "0xF7";
+    }
+
+    return "";
+  },
+};
diff --git a/browser/components/onionservices/content/netError/onionsite.svg b/browser/components/onionservices/content/netError/onionsite.svg
new file mode 100644
index 000000000000..c1b2d7382dc9
--- /dev/null
+++ b/browser/components/onionservices/content/netError/onionsite.svg
@@ -0,0 +1,8 @@
+<svg fill="none" height="60" viewBox="0 0 60 60" width="60" xmlns="http://www.w3.org/2000/svg";>
+  <g fill="context-fill" fill-opacity="context-fill-opacity">
+    <path clip-rule="evenodd" d="m11.25 6h37.5c1.9891 0 3.8968.79018 5.3033 2.1967s2.1967 3.3142 2.1967 5.3033v33.75c0 1.9891-.7902 3.8968-2.1967 5.3033s-3.3142 2.1967-5.3033 2.1967h-37.5c-1.98912 0-3.89678-.7902-5.3033-2.1967s-2.1967-3.3142-2.1967-5.3033v-33.75c0-1.9891.79018-3.89678 2.1967-5.3033s3.31418-2.1967 5.3033-2.1967zm-.5625 4.6875h38.625l2.25 2.25v34.875l-2.25 2.25h-38.625l-2.25-2.25v-34.875z" fill-rule="evenodd"/>
+    <path d="m15.9606 22c-.52 0-1.0187-.2107-1.3863-.5858-.3677-.3751-.5743-.8838-.5743-1.4142s.2066-1.0391.5743-1.4142c.3676-.3751.8663-.5858 1.3863-.5858h14.0788c.52 0 1.0187.2107 1.3863.5858.3677.3751.5743.8838.5743 1.4142s-.2066 1.0391-.5743 1.4142c-.3676.3751-.8663.5858-1.3863.5858z"/>
+    <path d="m44.0709 32h-28.1418c-.5116 0-1.0023-.2107-1.3641-.5858s-.565-.8838-.565-1.4142.2032-1.0391.565-1.4142.8525-.5858 1.3641-.5858h28.1418c.5116 0 1.0023.2107 1.3641.5858s.565.8838.565 1.4142-.2032 1.0391-.565 1.4142-.8525.5858-1.3641.5858z"/>
+    <path d="m44.0709 42h-28.1418c-.5116 0-1.0023-.2107-1.3641-.5858s-.565-.8838-.565-1.4142.2032-1.0391.565-1.4142.8525-.5858 1.3641-.5858h28.1418c.5116 0 1.0023.2107 1.3641.5858s.565.8838.565 1.4142-.2032 1.0391-.565 1.4142-.8525.5858-1.3641.5858z"/>
+  </g>
+</svg>
diff --git a/browser/components/onionservices/content/onionservices.css b/browser/components/onionservices/content/onionservices.css
new file mode 100644
index 000000000000..e2621ec8266d
--- /dev/null
+++ b/browser/components/onionservices/content/onionservices.css
@@ -0,0 +1,69 @@
+/* Copyright (c) 2020, The Tor Project, Inc. */
+
+@namespace html url("http://www.w3.org/1999/xhtml";);
+
+html|*#tor-clientauth-notification-onionname {
+  font-weight: bold;
+}
+
+html|*#tor-clientauth-notification-key {
+  box-sizing: border-box;
+  width: 100%;
+  margin-top: 15px;
+  padding: 6px;
+}
+
+/* Start of rules adapted from
+ * browser/components/newtab/css/activity-stream-mac.css (linux and windows
+ * use the same rules).
+ */
+html|*#tor-clientauth-notification-key.invalid {
+  border: 1px solid #D70022;
+  box-shadow: 0 0 0 1px #D70022, 0 0 0 4px rgba(215, 0, 34, 0.3);
+}
+
+html|*#tor-clientauth-warning {
+  display: inline-block;
+  animation: fade-up-tt 450ms;
+  background: #D70022;
+  border-radius: 2px;
+  color: #FFF;
+  inset-inline-start: 3px;
+  padding: 5px 12px;
+  position: relative;
+  top: 6px;
+  z-index: 1;
+}
+
+html|*#tor-clientauth-warning[hidden] {
+  display: none;
+}
+
+html|*#tor-clientauth-warning::before {
+  background: #D70022;
+  bottom: -8px;
+  content: '.';
+  height: 16px;
+  inset-inline-start: 12px;
+  position: absolute;
+  text-indent: -999px;
+  top: -7px;
+  transform: rotate(45deg);
+  white-space: nowrap;
+  width: 16px;
+  z-index: -1;
+}
+
+@keyframes fade-up-tt {
+  0% {
+    opacity: 0;
+    transform: translateY(15px);
+  }
+  100% {
+    opacity: 1;
+    transform: translateY(0);
+  }
+}
+/* End of rules adapted from
+ * browser/components/newtab/css/activity-stream-mac.css
+ */
diff --git a/browser/components/onionservices/content/savedKeysDialog.js b/browser/components/onionservices/content/savedKeysDialog.js
new file mode 100644
index 000000000000..b1376bbabe85
--- /dev/null
+++ b/browser/components/onionservices/content/savedKeysDialog.js
@@ -0,0 +1,259 @@
+// Copyright (c) 2020, The Tor Project, Inc.
+
+"use strict";
+
+ChromeUtils.defineModuleGetter(
+  this,
+  "TorStrings",
+  "resource:///modules/TorStrings.jsm"
+);
+
+ChromeUtils.defineModuleGetter(
+  this,
+  "controller",
+  "resource://torbutton/modules/tor-control-port.js"
+);
+
+var gOnionServicesSavedKeysDialog = {
+  selector: {
+    dialog: "#onionservices-savedkeys-dialog",
+    intro: "#onionservices-savedkeys-intro",
+    tree: "#onionservices-savedkeys-tree",
+    onionSiteCol: "#onionservices-savedkeys-siteCol",
+    onionKeyCol: "#onionservices-savedkeys-keyCol",
+    errorIcon: "#onionservices-savedkeys-errorIcon",
+    errorMessage: "#onionservices-savedkeys-errorMessage",
+    removeButton: "#onionservices-savedkeys-remove",
+    removeAllButton: "#onionservices-savedkeys-removeall",
+  },
+
+  _tree: undefined,
+  _isBusy: false, // true when loading data, deleting a key, etc.
+
+  // Public functions (called from outside this file).
+  async deleteSelectedKeys() {
+    this._setBusyState(true);
+
+    const indexesToDelete = [];
+    const count = this._tree.view.selection.getRangeCount();
+    for (let i = 0; i < count; ++i) {
+      const minObj = {};
+      const maxObj = {};
+      this._tree.view.selection.getRangeAt(i, minObj, maxObj);
+      for (let idx = minObj.value; idx <= maxObj.value; ++idx) {
+        indexesToDelete.push(idx);
+      }
+    }
+
+    if (indexesToDelete.length > 0) {
+      const controllerFailureMsg =
+        TorStrings.onionServices.authPreferences.failedToRemoveKey;
+      try {
+        const torController = controller(aError => {
+          this._showError(controllerFailureMsg);
+        });
+
+        // Remove in reverse index order to avoid issues caused by index changes.
+        for (let i = indexesToDelete.length - 1; i >= 0; --i) {
+          await this._deleteOneKey(torController, indexesToDelete[i]);
+        }
+      } catch (e) {
+        if (e.torMessage) {
+          this._showError(e.torMessage);
+        } else {
+          this._showError(controllerFailureMsg);
+        }
+      }
+    }
+
+    this._setBusyState(false);
+  },
+
+  async deleteAllKeys() {
+    this._tree.view.selection.selectAll();
+    await this.deleteSelectedKeys();
+  },
+
+  updateButtonsState() {
+    const haveSelection = this._tree.view.selection.getRangeCount() > 0;
+    const dialog = document.querySelector(this.selector.dialog);
+    const removeSelectedBtn = dialog.querySelector(this.selector.removeButton);
+    removeSelectedBtn.disabled = this._isBusy || !haveSelection;
+    const removeAllBtn = dialog.querySelector(this.selector.removeAllButton);
+    removeAllBtn.disabled = this._isBusy || this.rowCount === 0;
+  },
+
+  // Private functions.
+  _onLoad() {
+    document.mozSubdialogReady = this._init();
+  },
+
+  async _init() {
+    await this._populateXUL();
+
+    window.addEventListener("keypress", this._onWindowKeyPress.bind(this));
+
+    // We don't use await here because we want _loadSavedKeys() to run
+    // in the background and not block loading of this dialog.
+    this._loadSavedKeys();
+  },
+
+  async _populateXUL() {
+    const dialog = document.querySelector(this.selector.dialog);
+    const authPrefStrings = TorStrings.onionServices.authPreferences;
+    dialog.setAttribute("title", authPrefStrings.dialogTitle);
+
+    let elem = dialog.querySelector(this.selector.intro);
+    elem.textContent = authPrefStrings.dialogIntro;
+
+    elem = dialog.querySelector(this.selector.onionSiteCol);
+    elem.setAttribute("label", authPrefStrings.onionSite);
+
+    elem = dialog.querySelector(this.selector.onionKeyCol);
+    elem.setAttribute("label", authPrefStrings.onionKey);
+
+    elem = dialog.querySelector(this.selector.removeButton);
+    elem.setAttribute("label", authPrefStrings.remove);
+
+    elem = dialog.querySelector(this.selector.removeAllButton);
+    elem.setAttribute("label", authPrefStrings.removeAll);
+
+    this._tree = dialog.querySelector(this.selector.tree);
+  },
+
+  async _loadSavedKeys() {
+    const controllerFailureMsg =
+      TorStrings.onionServices.authPreferences.failedToGetKeys;
+    this._setBusyState(true);
+
+    try {
+      this._tree.view = this;
+
+      const torController = controller(aError => {
+        this._showError(controllerFailureMsg);
+      });
+
+      const keyInfoList = await torController.onionAuthViewKeys();
+      if (keyInfoList) {
+        // Filter out temporary keys.
+        this._keyInfoList = keyInfoList.filter(aKeyInfo => {
+          if (!aKeyInfo.Flags) {
+            return false;
+          }
+
+          const flags = aKeyInfo.Flags.split(",");
+          return flags.includes("Permanent");
+        });
+
+        // Sort by the .onion address.
+        this._keyInfoList.sort((aObj1, aObj2) => {
+          const hsAddr1 = aObj1.hsAddress.toLowerCase();
+          const hsAddr2 = aObj2.hsAddress.toLowerCase();
+          if (hsAddr1 < hsAddr2) {
+            return -1;
+          }
+          return hsAddr1 > hsAddr2 ? 1 : 0;
+        });
+      }
+
+      // Render the tree content.
+      this._tree.rowCountChanged(0, this.rowCount);
+    } catch (e) {
+      if (e.torMessage) {
+        this._showError(e.torMessage);
+      } else {
+        this._showError(controllerFailureMsg);
+      }
+    }
+
+    this._setBusyState(false);
+  },
+
+  // This method may throw; callers should catch errors.
+  async _deleteOneKey(aTorController, aIndex) {
+    const keyInfoObj = this._keyInfoList[aIndex];
+    await aTorController.onionAuthRemove(keyInfoObj.hsAddress);
+    this._tree.view.selection.clearRange(aIndex, aIndex);
+    this._keyInfoList.splice(aIndex, 1);
+    this._tree.rowCountChanged(aIndex + 1, -1);
+  },
+
+  _setBusyState(aIsBusy) {
+    this._isBusy = aIsBusy;
+    this.updateButtonsState();
+  },
+
+  _onWindowKeyPress(event) {
+    if (event.keyCode === KeyEvent.DOM_VK_ESCAPE) {
+      window.close();
+    } else if (event.keyCode === KeyEvent.DOM_VK_DELETE) {
+      this.deleteSelectedKeys();
+    }
+  },
+
+  _showError(aMessage) {
+    const dialog = document.querySelector(this.selector.dialog);
+    const errorIcon = dialog.querySelector(this.selector.errorIcon);
+    errorIcon.style.visibility = aMessage ? "visible" : "hidden";
+    const errorDesc = dialog.querySelector(this.selector.errorMessage);
+    errorDesc.textContent = aMessage ? aMessage : "";
+  },
+
+  // XUL tree widget view implementation.
+  get rowCount() {
+    return this._keyInfoList ? this._keyInfoList.length : 0;
+  },
+
+  getCellText(aRow, aCol) {
+    let val = "";
+    if (this._keyInfoList && aRow < this._keyInfoList.length) {
+      const keyInfo = this._keyInfoList[aRow];
+      if (aCol.id.endsWith("-siteCol")) {
+        val = keyInfo.hsAddress;
+      } else if (aCol.id.endsWith("-keyCol")) {
+        val = keyInfo.typeAndKey;
+        // Omit keyType because it is always "x25519".
+        const idx = val.indexOf(":");
+        if (idx > 0) {
+          val = val.substring(idx + 1);
+        }
+      }
+    }
+
+    return val;
+  },
+
+  isSeparator(index) {
+    return false;
+  },
+
+  isSorted() {
+    return false;
+  },
+
+  isContainer(index) {
+    return false;
+  },
+
+  setTree(tree) {},
+
+  getImageSrc(row, column) {},
+
+  getCellValue(row, column) {},
+
+  cycleHeader(column) {},
+
+  getRowProperties(row) {
+    return "";
+  },
+
+  getColumnProperties(column) {
+    return "";
+  },
+
+  getCellProperties(row, column) {
+    return "";
+  },
+};
+
+window.addEventListener("load", () => gOnionServicesSavedKeysDialog._onLoad());
diff --git a/browser/components/onionservices/content/savedKeysDialog.xhtml b/browser/components/onionservices/content/savedKeysDialog.xhtml
new file mode 100644
index 000000000000..3db9bb05ea82
--- /dev/null
+++ b/browser/components/onionservices/content/savedKeysDialog.xhtml
@@ -0,0 +1,42 @@
+<?xml version="1.0"?>
+<!-- Copyright (c) 2020, The Tor Project, Inc. -->
+
+<?xml-stylesheet href="chrome://global/skin/" type="text/css"?>
+<?xml-stylesheet href="chrome://browser/skin/preferences/preferences.css" type="text/css"?>
+<?xml-stylesheet href="chrome://browser/content/onionservices/authPreferences.css" type="text/css"?>
+
+<window id="onionservices-savedkeys-dialog"
+    windowtype="OnionServices:SavedKeys"
+    xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul";
+    style="width: 45em;">
+
+  <script src="chrome://browser/content/onionservices/savedKeysDialog.js"/>
+
+  <vbox id="onionservices-savedkeys" class="contentPane" flex="1">
+    <label id="onionservices-savedkeys-intro"
+           control="onionservices-savedkeys-tree"/>
+    <separator class="thin"/>
+    <tree id="onionservices-savedkeys-tree" flex="1" hidecolumnpicker="true"
+          width="750"
+          style="height: 20em;"
+          onselect="gOnionServicesSavedKeysDialog.updateButtonsState();">
+      <treecols>
+        <treecol id="onionservices-savedkeys-siteCol" flex="1" persist="width"/>
+        <splitter class="tree-splitter"/>
+        <treecol id="onionservices-savedkeys-keyCol" flex="1" persist="width"/>
+      </treecols>
+      <treechildren/>
+    </tree>
+    <hbox id="onionservices-savedkeys-errorContainer" align="baseline" flex="1">
+      <image id="onionservices-savedkeys-errorIcon"/>
+      <description id="onionservices-savedkeys-errorMessage" flex="1"/>
+    </hbox>
+    <separator class="thin"/>
+    <hbox id="onionservices-savedkeys-buttons">
+      <button id="onionservices-savedkeys-remove" disabled="true"
+              oncommand="gOnionServicesSavedKeysDialog.deleteSelectedKeys();"/>
+      <button id="onionservices-savedkeys-removeall"
+              oncommand="gOnionServicesSavedKeysDialog.deleteAllKeys();"/>
+    </hbox>
+  </vbox>
+</window>
diff --git a/browser/components/onionservices/jar.mn b/browser/components/onionservices/jar.mn
new file mode 100644
index 000000000000..9d6ce88d1841
--- /dev/null
+++ b/browser/components/onionservices/jar.mn
@@ -0,0 +1,9 @@
+browser.jar:
+    content/browser/onionservices/authPreferences.css              (content/authPreferences.css)
+    content/browser/onionservices/authPreferences.js               (content/authPreferences.js)
+    content/browser/onionservices/authPrompt.js                    (content/authPrompt.js)
+    content/browser/onionservices/authUtil.jsm                     (content/authUtil.jsm)
+    content/browser/onionservices/netError/                        (content/netError/*)
+    content/browser/onionservices/onionservices.css                (content/onionservices.css)
+    content/browser/onionservices/savedKeysDialog.js               (content/savedKeysDialog.js)
+    content/browser/onionservices/savedKeysDialog.xhtml            (content/savedKeysDialog.xhtml)
diff --git a/browser/components/onionservices/moz.build b/browser/components/onionservices/moz.build
new file mode 100644
index 000000000000..2661ad7cb9f3
--- /dev/null
+++ b/browser/components/onionservices/moz.build
@@ -0,0 +1 @@
+JAR_MANIFESTS += ["jar.mn"]
diff --git a/browser/components/preferences/preferences.xhtml b/browser/components/preferences/preferences.xhtml
index 0139abf95cbd..07ab5cc7b626 100644
--- a/browser/components/preferences/preferences.xhtml
+++ b/browser/components/preferences/preferences.xhtml
@@ -12,6 +12,7 @@
 <?xml-stylesheet href="chrome://browser/skin/preferences/search.css"?>
 <?xml-stylesheet href="chrome://browser/skin/preferences/containers.css"?>
 <?xml-stylesheet href="chrome://browser/skin/preferences/privacy.css"?>
+<?xml-stylesheet href="chrome://browser/content/onionservices/authPreferences.css"?>
 <?xml-stylesheet href="chrome://browser/content/securitylevel/securityLevelPreferences.css"?>
 <?xml-stylesheet href="chrome://browser/content/torpreferences/torPreferences.css"?>
 
diff --git a/browser/components/preferences/privacy.inc.xhtml b/browser/components/preferences/privacy.inc.xhtml
index 3e0c0c8dc74c..7d3bc3a663ed 100644
--- a/browser/components/preferences/privacy.inc.xhtml
+++ b/browser/components/preferences/privacy.inc.xhtml
@@ -505,6 +505,8 @@
   <label id="fips-desc" hidden="true" data-l10n-id="forms-master-pw-fips-desc"></label>
 </groupbox>
 
+#include ../onionservices/content/authPreferences.inc.xhtml
+
 <!-- The form autofill section is inserted in to this box
      after the form autofill extension has initialized. -->
 <groupbox id="formAutofillGroupBox"
diff --git a/browser/components/preferences/privacy.js b/browser/components/preferences/privacy.js
index bce7bb7e8a9c..932d4291e486 100644
--- a/browser/components/preferences/privacy.js
+++ b/browser/components/preferences/privacy.js
@@ -80,6 +80,12 @@ XPCOMUtils.defineLazyGetter(this, "AlertsServiceDND", function() {
   }
 });
 
+XPCOMUtils.defineLazyScriptGetter(
+  this,
+  ["OnionServicesAuthPreferences"],
+  "chrome://browser/content/onionservices/authPreferences.js"
+);
+
 // TODO: module import via ChromeUtils.defineModuleGetter
 XPCOMUtils.defineLazyScriptGetter(
   this,
@@ -522,6 +528,7 @@ var gPrivacyPane = {
     this.trackingProtectionReadPrefs();
     this.networkCookieBehaviorReadPrefs();
     this._initTrackingProtectionExtensionControl();
+    OnionServicesAuthPreferences.init();
     this._initSecurityLevel();
 
     Services.telemetry.setEventRecordingEnabled("pwmgr", true);
diff --git a/browser/themes/shared/notification-icons.inc.css b/browser/themes/shared/notification-icons.inc.css
index 658fa7f7430a..67dd640baf16 100644
--- a/browser/themes/shared/notification-icons.inc.css
+++ b/browser/themes/shared/notification-icons.inc.css
@@ -137,6 +137,9 @@
   list-style-image: url(chrome://browser/skin/notification-icons/persistent-storage.svg);
 }
 
+/* Reuse Firefox's login (key) icon for the Tor onion services auth. prompt */
+.popup-notification-icon[popupid="tor-clientauth"],
+.tor-clientauth-icon,
 .popup-notification-icon[popupid="password"],
 .login-icon {
   list-style-image: url(chrome://browser/skin/login.svg);
diff --git a/docshell/base/nsDocShell.cpp b/docshell/base/nsDocShell.cpp
index d9e525dec948..a1029b47bcf1 100644
--- a/docshell/base/nsDocShell.cpp
+++ b/docshell/base/nsDocShell.cpp
@@ -3587,6 +3587,7 @@ nsDocShell::DisplayLoadError(nsresult aError, nsIURI* aURI,
     }
   } else {
     // Errors requiring simple formatting
+    bool isOnionAuthError = false;
     switch (aError) {
       case NS_ERROR_MALFORMED_URI:
         // URI is malformed
@@ -3669,10 +3670,44 @@ nsDocShell::DisplayLoadError(nsresult aError, nsIURI* aURI,
         // HTTP/2 or HTTP/3 stack detected a protocol error
         error = "networkProtocolError";
         break;
-
+      case NS_ERROR_TOR_ONION_SVC_NOT_FOUND:
+        error = "onionServices.descNotFound";
+        break;
+      case NS_ERROR_TOR_ONION_SVC_IS_INVALID:
+        error = "onionServices.descInvalid";
+        break;
+      case NS_ERROR_TOR_ONION_SVC_INTRO_FAILED:
+        error = "onionServices.introFailed";
+        break;
+      case NS_ERROR_TOR_ONION_SVC_REND_FAILED:
+        error = "onionServices.rendezvousFailed";
+        break;
+      case NS_ERROR_TOR_ONION_SVC_MISSING_CLIENT_AUTH:
+        error = "onionServices.clientAuthMissing";
+        isOnionAuthError = true;
+        break;
+      case NS_ERROR_TOR_ONION_SVC_BAD_CLIENT_AUTH:
+        error = "onionServices.clientAuthIncorrect";
+        isOnionAuthError = true;
+        break;
+      case NS_ERROR_TOR_ONION_SVC_BAD_ADDRESS:
+        error = "onionServices.badAddress";
+        break;
+      case NS_ERROR_TOR_ONION_SVC_INTRO_TIMEDOUT:
+        error = "onionServices.introTimedOut";
+        break;
       default:
         break;
     }
+
+    // The presence of aFailedChannel indicates that we arrived here due to a
+    // failed connection attempt. Note that we will arrive here a second time
+    // if the user cancels the Tor client auth prompt, but in that case we
+    // will not have a failed channel and therefore we will not prompt again.
+    if (isOnionAuthError && aFailedChannel) {
+      // Display about:blank while the Tor client auth prompt is open.
+      errorPage.AssignLiteral("blank");
+    }
   }
 
   // If the HTTPS-Only Mode upgraded this request and the upgrade might have
@@ -3755,6 +3790,20 @@ nsDocShell::DisplayLoadError(nsresult aError, nsIURI* aURI,
     nsAutoString str;
     rv =
         stringBundle->FormatStringFromName(errorDescriptionID, formatStrs, str);
+    if (NS_FAILED(rv)) {
+      // As a fallback, check torbutton.properties for the error string.
+      const char bundleURL[] = "chrome://torbutton/locale/torbutton.properties";
+      nsCOMPtr<nsIStringBundleService> stringBundleService =
+          mozilla::services::GetStringBundleService();
+      if (stringBundleService) {
+        nsCOMPtr<nsIStringBundle> tbStringBundle;
+        if (NS_SUCCEEDED(stringBundleService->CreateBundle(
+                bundleURL, getter_AddRefs(tbStringBundle)))) {
+          rv = tbStringBundle->FormatStringFromName(errorDescriptionID,
+                                                    formatStrs, str);
+        }
+      }
+    }
     NS_ENSURE_SUCCESS(rv, rv);
     messageStr.Assign(str);
   }
@@ -6173,6 +6222,7 @@ nsresult nsDocShell::FilterStatusForErrorPage(
       aStatus == NS_ERROR_FILE_ACCESS_DENIED ||
       aStatus == NS_ERROR_CORRUPTED_CONTENT ||
       aStatus == NS_ERROR_INVALID_CONTENT_ENCODING ||
+      NS_ERROR_GET_MODULE(aStatus) == NS_ERROR_MODULE_TOR ||
       NS_ERROR_GET_MODULE(aStatus) == NS_ERROR_MODULE_SECURITY) {
     // Errors to be shown for any frame
     return aStatus;
@@ -7956,6 +8006,35 @@ nsresult nsDocShell::CreateContentViewer(const nsACString& aContentType,
     FireOnLocationChange(this, aRequest, mCurrentURI, locationFlags);
   }
 
+  // Arrange to show a Tor onion service client authentication prompt if
+  // appropriate.
+  if ((mLoadType == LOAD_ERROR_PAGE) && failedChannel) {
+    nsresult status = NS_OK;
+    if (NS_SUCCEEDED(failedChannel->GetStatus(&status)) &&
+        ((status == NS_ERROR_TOR_ONION_SVC_MISSING_CLIENT_AUTH) ||
+         (status == NS_ERROR_TOR_ONION_SVC_BAD_CLIENT_AUTH))) {
+      nsAutoCString onionHost;
+      failedURI->GetHost(onionHost);
+      const char* topic = (status == NS_ERROR_TOR_ONION_SVC_MISSING_CLIENT_AUTH)
+                              ? "tor-onion-services-clientauth-missing"
+                              : "tor-onion-services-clientauth-incorrect";
+      if (XRE_IsContentProcess()) {
+        nsCOMPtr<nsIBrowserChild> browserChild = GetBrowserChild();
+        if (browserChild) {
+          static_cast<BrowserChild*>(browserChild.get())
+              ->SendShowOnionServicesAuthPrompt(onionHost, nsCString(topic));
+        }
+      } else {
+        nsCOMPtr<nsPIDOMWindowOuter> browserWin = GetWindow();
+        nsCOMPtr<nsIObserverService> obsSvc = services::GetObserverService();
+        if (browserWin && obsSvc) {
+          obsSvc->NotifyObservers(browserWin, topic,
+                                  NS_ConvertUTF8toUTF16(onionHost).get());
+        }
+      }
+    }
+  }
+
   return NS_OK;
 }
 
diff --git a/dom/ipc/BrowserParent.cpp b/dom/ipc/BrowserParent.cpp
index 05d77937f986..4145111ae849 100644
--- a/dom/ipc/BrowserParent.cpp
+++ b/dom/ipc/BrowserParent.cpp
@@ -3810,6 +3810,27 @@ mozilla::ipc::IPCResult BrowserParent::RecvShowCanvasPermissionPrompt(
   return IPC_OK();
 }
 
+mozilla::ipc::IPCResult BrowserParent::RecvShowOnionServicesAuthPrompt(
+    const nsCString& aOnionName, const nsCString& aTopic) {
+  nsCOMPtr<nsIBrowser> browser =
+      mFrameElement ? mFrameElement->AsBrowser() : nullptr;
+  if (!browser) {
+    // If the tab is being closed, the browser may not be available.
+    // In this case we can ignore the request.
+    return IPC_OK();
+  }
+  nsCOMPtr<nsIObserverService> os = services::GetObserverService();
+  if (!os) {
+    return IPC_FAIL_NO_REASON(this);
+  }
+  nsresult rv = os->NotifyObservers(browser, aTopic.get(),
+                                    NS_ConvertUTF8toUTF16(aOnionName).get());
+  if (NS_FAILED(rv)) {
+    return IPC_FAIL_NO_REASON(this);
+  }
+  return IPC_OK();
+}
+
 mozilla::ipc::IPCResult BrowserParent::RecvVisitURI(nsIURI* aURI,
                                                     nsIURI* aLastVisitedURI,
                                                     const uint32_t& aFlags) {
diff --git a/dom/ipc/BrowserParent.h b/dom/ipc/BrowserParent.h
index 80e4d055e26c..a36ebfc8ca05 100644
--- a/dom/ipc/BrowserParent.h
+++ b/dom/ipc/BrowserParent.h
@@ -736,6 +736,9 @@ class BrowserParent final : public PBrowserParent,
   mozilla::ipc::IPCResult RecvShowCanvasPermissionPrompt(
       const nsCString& aOrigin, const bool& aHideDoorHanger);
 
+  mozilla::ipc::IPCResult RecvShowOnionServicesAuthPrompt(
+      const nsCString& aOnionName, const nsCString& aTopic);
+
   mozilla::ipc::IPCResult RecvSetSystemFont(const nsCString& aFontName);
   mozilla::ipc::IPCResult RecvGetSystemFont(nsCString* aFontName);
 
diff --git a/dom/ipc/PBrowser.ipdl b/dom/ipc/PBrowser.ipdl
index 9750219fa46a..5706c7f5da00 100644
--- a/dom/ipc/PBrowser.ipdl
+++ b/dom/ipc/PBrowser.ipdl
@@ -577,6 +577,15 @@ parent:
     async RequestPointerCapture(uint32_t aPointerId) returns (bool aSuccess);
     async ReleasePointerCapture(uint32_t aPointerId);
 
+    /**
+     * This function is used to notify the parent that it should display a
+     * onion services client authentication prompt.
+     *
+     * @param aOnionHost The hostname of the .onion that needs authentication.
+     * @param aTopic The reason for the prompt.
+     */
+    async ShowOnionServicesAuthPrompt(nsCString aOnionHost, nsCString aTopic);
+
 child:
     async NativeSynthesisResponse(uint64_t aObserverId, nsCString aResponse);
     async UpdateEpoch(uint32_t aEpoch);
diff --git a/js/xpconnect/src/xpc.msg b/js/xpconnect/src/xpc.msg
index c7fbdd23f378..07f529957bd0 100644
--- a/js/xpconnect/src/xpc.msg
+++ b/js/xpconnect/src/xpc.msg
@@ -248,5 +248,15 @@ XPC_MSG_DEF(NS_ERROR_FINGERPRINTING_URI               , "The URI is fingerprinti
 XPC_MSG_DEF(NS_ERROR_CRYPTOMINING_URI                 , "The URI is cryptomining")
 XPC_MSG_DEF(NS_ERROR_SOCIALTRACKING_URI               , "The URI is social tracking")
 
+/* Codes related to Tor */
+XPC_MSG_DEF(NS_ERROR_TOR_ONION_SVC_NOT_FOUND          , "Tor onion service descriptor cannot be found")
+XPC_MSG_DEF(NS_ERROR_TOR_ONION_SVC_IS_INVALID         , "Tor onion service descriptor is invalid")
+XPC_MSG_DEF(NS_ERROR_TOR_ONION_SVC_INTRO_FAILED       , "Tor onion service introduction failed")
+XPC_MSG_DEF(NS_ERROR_TOR_ONION_SVC_REND_FAILED        , "Tor onion service rendezvous failed")
+XPC_MSG_DEF(NS_ERROR_TOR_ONION_SVC_MISSING_CLIENT_AUTH, "Tor onion service missing client authorization")
+XPC_MSG_DEF(NS_ERROR_TOR_ONION_SVC_BAD_CLIENT_AUTH    , "Tor onion service wrong client authorization")
+XPC_MSG_DEF(NS_ERROR_TOR_ONION_SVC_BAD_ADDRESS        , "Tor onion service bad address")
+XPC_MSG_DEF(NS_ERROR_TOR_ONION_SVC_INTRO_TIMEDOUT     , "Tor onion service introduction timed out")
+
 /* Profile manager error codes */
 XPC_MSG_DEF(NS_ERROR_DATABASE_CHANGED                 , "Flushing the profiles to disk would have overwritten changes made elsewhere.")
diff --git a/netwerk/base/nsSocketTransport2.cpp b/netwerk/base/nsSocketTransport2.cpp
index 8f44441e1fd0..99a6f3b60ac3 100644
--- a/netwerk/base/nsSocketTransport2.cpp
+++ b/netwerk/base/nsSocketTransport2.cpp
@@ -216,6 +216,12 @@ nsresult ErrorAccordingToNSPR(PRErrorCode errorCode) {
     default:
       if (psm::IsNSSErrorCode(errorCode)) {
         rv = psm::GetXPCOMFromNSSError(errorCode);
+      } else {
+        // If we received a Tor extended error code via SOCKS, pass it through.
+        nsresult res = nsresult(errorCode);
+        if (NS_ERROR_GET_MODULE(res) == NS_ERROR_MODULE_TOR) {
+          rv = res;
+        }
       }
       break;
 
diff --git a/netwerk/socket/nsSOCKSIOLayer.cpp b/netwerk/socket/nsSOCKSIOLayer.cpp
index 119a3cbf4c51..f9fc29552ace 100644
--- a/netwerk/socket/nsSOCKSIOLayer.cpp
+++ b/netwerk/socket/nsSOCKSIOLayer.cpp
@@ -979,6 +979,55 @@ PRStatus nsSOCKSSocketInfo::ReadV5ConnectResponseTop() {
              "08, Address type not supported."));
         c = PR_BAD_ADDRESS_ERROR;
         break;
+      case 0xF0:  // Tor SOCKS5_HS_NOT_FOUND
+        LOGERROR(
+            ("socks5: connect failed: F0,"
+             " Tor onion service descriptor can not be found."));
+        c = static_cast<uint32_t>(NS_ERROR_TOR_ONION_SVC_NOT_FOUND);
+        break;
+      case 0xF1:  // Tor SOCKS5_HS_IS_INVALID
+        LOGERROR(
+            ("socks5: connect failed: F1,"
+             " Tor onion service descriptor is invalid."));
+        c = static_cast<uint32_t>(NS_ERROR_TOR_ONION_SVC_IS_INVALID);
+        break;
+      case 0xF2:  // Tor SOCKS5_HS_INTRO_FAILED
+        LOGERROR(
+            ("socks5: connect failed: F2,"
+             " Tor onion service introduction failed."));
+        c = static_cast<uint32_t>(NS_ERROR_TOR_ONION_SVC_INTRO_FAILED);
+        break;
+      case 0xF3:  // Tor SOCKS5_HS_REND_FAILED
+        LOGERROR(
+            ("socks5: connect failed: F3,"
+             " Tor onion service rendezvous failed."));
+        c = static_cast<uint32_t>(NS_ERROR_TOR_ONION_SVC_REND_FAILED);
+        break;
+      case 0xF4:  // Tor SOCKS5_HS_MISSING_CLIENT_AUTH
+        LOGERROR(
+            ("socks5: connect failed: F4,"
+             " Tor onion service missing client authorization."));
+        c = static_cast<uint32_t>(NS_ERROR_TOR_ONION_SVC_MISSING_CLIENT_AUTH);
+        break;
+      case 0xF5:  // Tor SOCKS5_HS_BAD_CLIENT_AUTH
+        LOGERROR(
+            ("socks5: connect failed: F5,"
+             " Tor onion service wrong client authorization."));
+        c = static_cast<uint32_t>(NS_ERROR_TOR_ONION_SVC_BAD_CLIENT_AUTH);
+        break;
+      case 0xF6:  // Tor SOCKS5_HS_BAD_ADDRESS
+        LOGERROR(
+            ("socks5: connect failed: F6,"
+             " Tor onion service bad address."));
+        c = static_cast<uint32_t>(NS_ERROR_TOR_ONION_SVC_BAD_ADDRESS);
+        break;
+      case 0xF7:  // Tor SOCKS5_HS_INTRO_TIMEDOUT
+        LOGERROR(
+            ("socks5: connect failed: F7,"
+             " Tor onion service introduction timed out."));
+        c = static_cast<uint32_t>(NS_ERROR_TOR_ONION_SVC_INTRO_TIMEDOUT);
+        break;
+
       default:
         LOGERROR(("socks5: connect failed."));
         break;
diff --git a/toolkit/modules/PopupNotifications.jsm b/toolkit/modules/PopupNotifications.jsm
index d6518723afab..9764cfd496c3 100644
--- a/toolkit/modules/PopupNotifications.jsm
+++ b/toolkit/modules/PopupNotifications.jsm
@@ -410,6 +410,8 @@ PopupNotifications.prototype = {
    *            will be dismissed instead of removed after running the callback.
    *          - [optional] disabled (boolean): If this is true, the button
    *            will be disabled.
+  *           - [optional] leaveOpen (boolean): If this is true, the notification
+   *            will not be removed after running the callback.
    *          - [optional] disableHighlight (boolean): If this is true, the button
    *            will not apply the default highlight style.
    *        If null, the notification will have a default "OK" action button
@@ -1916,6 +1918,10 @@ PopupNotifications.prototype = {
         this._dismiss();
         return;
       }
+
+      if (action.leaveOpen) {
+        return;
+      }
     }
 
     this._remove(notification);
diff --git a/toolkit/modules/RemotePageAccessManager.jsm b/toolkit/modules/RemotePageAccessManager.jsm
index e5111ff83782..c12e71ac4d42 100644
--- a/toolkit/modules/RemotePageAccessManager.jsm
+++ b/toolkit/modules/RemotePageAccessManager.jsm
@@ -102,6 +102,7 @@ let RemotePageAccessManager = {
       RPMAddToHistogram: ["*"],
       RPMGetInnerMostURI: ["*"],
       RPMGetHttpResponseHeader: ["*"],
+      RPMGetTorStrings: ["*"],
     },
     "about:plugins": {
       RPMSendQuery: ["RequestPlugins"],
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/environments/frame-script.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/environments/frame-script.js
index 15c15615ad97..57458ba0bf5e 100644
--- a/tools/lint/eslint/eslint-plugin-mozilla/lib/environments/frame-script.js
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/environments/frame-script.js
@@ -41,5 +41,6 @@ module.exports = {
     RPMGetHttpResponseHeader: false,
     RPMTryPingSecureWWWLink: false,
     RPMOpenSecureWWWLink: false,
+    RPMGetTorStrings: false,
   },
 };
diff --git a/xpcom/base/ErrorList.py b/xpcom/base/ErrorList.py
index c22c27be8546..8fbcc7f663df 100755
--- a/xpcom/base/ErrorList.py
+++ b/xpcom/base/ErrorList.py
@@ -89,6 +89,7 @@ modules["ERRORRESULT"] = Mod(43)
 # Win32 system error codes, which are not mapped to a specific other value,
 # see Bug 1686041.
 modules["WIN32"] = Mod(44)
+modules["TOR"] = Mod(45)
 
 # NS_ERROR_MODULE_GENERAL should be used by modules that do not
 # care if return code values overlap. Callers of methods that
@@ -1181,6 +1182,27 @@ with modules["ERRORRESULT"]:
     errors["NS_ERROR_INTERNAL_ERRORRESULT_RANGEERROR"] = FAILURE(5)
 
 
+# =======================================================================
+# 45: Tor-specific error codes.
+# =======================================================================
+with modules["TOR"]:
+    # Tor onion service descriptor can not be found.
+    errors["NS_ERROR_TOR_ONION_SVC_NOT_FOUND"] = FAILURE(1)
+    # Tor onion service descriptor is invalid.
+    errors["NS_ERROR_TOR_ONION_SVC_IS_INVALID"] = FAILURE(2)
+    # Tor onion service introduction failed.
+    errors["NS_ERROR_TOR_ONION_SVC_INTRO_FAILED"] = FAILURE(3)
+    # Tor onion service rendezvous failed.
+    errors["NS_ERROR_TOR_ONION_SVC_REND_FAILED"] = FAILURE(4)
+    # Tor onion service missing client authorization.
+    errors["NS_ERROR_TOR_ONION_SVC_MISSING_CLIENT_AUTH"] = FAILURE(5)
+    # Tor onion service wrong client authorization.
+    errors["NS_ERROR_TOR_ONION_SVC_BAD_CLIENT_AUTH"] = FAILURE(6)
+    # Tor onion service bad address.
+    errors["NS_ERROR_TOR_ONION_SVC_BAD_ADDRESS"] = FAILURE(7)
+    # Tor onion service introduction timed out.
+    errors["NS_ERROR_TOR_ONION_SVC_INTRO_TIMEDOUT"] = FAILURE(8)
+
 # =======================================================================
 # 51: NS_ERROR_MODULE_GENERAL
 # =======================================================================



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