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[tor-bugs] #29634 [Applications/Tor Browser]: Riot.im local storage lost when closing tab

#29634: Riot.im local storage lost when closing tab
-------------------------------------+-------------------------------------
 Reporter:  0tzVNmkQxgql             |          Owner:  tbb-team
     Type:  defect                   |         Status:  new
 Priority:  Medium                   |      Component:  Applications/Tor
                                     |  Browser
  Version:                           |       Severity:  Normal
 Keywords:  riot, matrix, local      |  Actual Points:
  storage                            |
Parent ID:                           |         Points:
 Reviewer:                           |        Sponsor:
-------------------------------------+-------------------------------------
 I am trying to use the official release instance of the Riot client for
 Matrix at https://riot.im/app . I have configured Tor Browser to keep site
 data for riot.im. Security level is Standard.

 When I log into Riot, I can see in TB's Storage Inspector that data is
 written to IndexedDB and Local Storage. When I close the Riot tab and
 reopen Riot in a new tab, I am no longer logged in. In Storage Inspector,
 the IndexedDB data seems to persist (even over browser restarts, as
 intended), but Local Storage was not kept when closing the tab and a new
 guest session is written.

 I have reproduced this problem on Riot v0.17.8 and later, as well as Tor
 Browser 8.0.4 and later. It does not occur on Firefox ESR. Without
 persistent Local Storage, it is not possible to use the device-based E2E
 encryption that Matrix offers, because old messages will not decrypt
 properly and all communication partners have to re-verify my "devices"
 every time I close the tab and log back in.

 IMO, Tor Browser should keep all data stored by sites that are explicitly
 whitelisted by the user, not just cookies and IndexedDB.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/29634>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online

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