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[tor-bugs] #32017 [Applications/Tor Browser]: Switch back extensions.webextensions.ExtensionStorageIDB.enabled = true

#32017: Switch back extensions.webextensions.ExtensionStorageIDB.enabled = true
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     Reporter:  acat                      |      Owner:  tbb-team
         Type:  enhancement               |     Status:  new
     Priority:  Medium                    |  Milestone:
    Component:  Applications/Tor Browser  |    Version:
     Severity:  Normal                    |   Keywords:
Actual Points:                            |  Parent ID:
       Points:                            |   Reviewer:
      Sponsor:                            |
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 In #31396 we set `extensions.webextensions.ExtensionStorageIDB.enabled =
 false` to avoid problems with the new idb storage for extensions and the
 `Services.qms.clear()` that we were doing in torbutton. After #30504 and
 #19417 were fixed, turning that pref back to the default should be
 possible.

 However, we should check that it's not possible for browsers that were
 affected by the original bug (`Services.qms.clear()` clearing the internal
 indexeddbs) to end up in a bad state that the browser cannot recover from.
 We should make sure that the
 `extensions.webextensions.ExtensionStorageIDB.migrated` pref branch is
 cleared so that the migrations are performed on first start after a
 browser upgrade containing the fix.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/32017>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online

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