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[tor-commits] [Git][tpo/applications/mullvad-browser][mullvad-browser-150.0a1-16.0-2] 2 commits: fixup! Firefox preference overrides.

Title: GitLab

Pier Angelo Vendrame pushed to branch mullvad-browser-150.0a1-16.0-2 at The Tor Project / Applications / Mullvad Browser

Commits:

  • 8ac56cce
    by Pier Angelo Vendrame at 2026-04-28T08:52:55+02:00 
    fixup! Firefox preference overrides.

BB 44521: Disable widget.wayland.fractional-scale.enabled.

It introduces fingerprinting opportunities to users who manually
enabled Wayland, so disable it until we decide to make Wayland the
default also for our browsers.
  • 775f0ef3
    by Pier Angelo Vendrame at 2026-04-28T08:53:06+02:00 
    fixup! BB 44772: Disable efficient randomization for canvases.

BB 44895: Revert "BB 44772: Disable efficient randomization for canvases."

This reverts commit ced1d9a35c7d8cbb727d8c1c450b2dce62cd7289.

We have investigated this issue more, and this change was not needed
after all, therefore we can just revert this patch.

2 changed files:

Changes:

  • browser/app/profile/001-base-profile.js
    ... ... @@ -585,6 +585,9 @@ pref("widget.wayland.vsync.enabled", false);
    585 585 
     // marked with a specific rating is loaded or not.
    586 586 
     pref("security.restrict_to_adults.always", false);
    587 587 
     pref("security.restrict_to_adults.respect_platform", false);
    588 
    +// tor-browser#44521: Disable Wayland fractional scaling at least until we keep
    589 
    +// Xwayland as the default.
    590 
    +pref("widget.wayland.fractional-scale.enabled", false);
    588 591
    589 592 
     // tor-browser#41943: defense-in-depth, but do not lock anymore (enabled in Firefox 119, http://bugzil.la/1851162)
    590 593 
     pref("_javascript_.options.spectre.disable_for_isolated_content", false);

  • dom/canvas/CanvasUtils.cpp
    ... ... @@ -381,9 +381,14 @@ ImageExtraction ImageExtractionResult(dom::HTMLCanvasElement* aCanvasElement,
    381 381 
         return ImageExtraction::Placeholder;
    382 382 
       }
    383 383
    384 
    -  if ((ownerDoc->ShouldResistFingerprinting(
    385 
    -           RFPTarget::EfficientCanvasRandomization) ||
    386 
    -       ownerDoc->ShouldResistFingerprinting(RFPTarget::CanvasRandomization) ||
    384 
    +  if (ownerDoc->ShouldResistFingerprinting(
    385 
    +          RFPTarget::EfficientCanvasRandomization) &&
    386 
    +      GetCanvasExtractDataPermission(aPrincipal) !=
    387 
    +          nsIPermissionManager::ALLOW_ACTION) {
    388 
    +    return ImageExtraction::EfficientRandomize;
    389 
    +  }
    390 
    +
    391 
    +  if ((ownerDoc->ShouldResistFingerprinting(RFPTarget::CanvasRandomization) ||
    387 392 
            ownerDoc->ShouldResistFingerprinting(RFPTarget::WebGLRandomization)) &&
    388 393 
           GetCanvasExtractDataPermission(aPrincipal) !=
    389 394 
               nsIPermissionManager::ALLOW_ACTION) {

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