[tor-bugs] #12683 [Tor Browser]: Permissions in nsIPermissionManager aren't cleared with TorButton's "New Identity"

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#12683: Permissions in nsIPermissionManager aren't cleared with TorButton's "New
Identity"
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     Reporter:  isis     |      Owner:  tbb-team
         Type:  defect   |     Status:  new
     Priority:  major    |  Milestone:
    Component:  Tor      |    Version:
  Browser                |   Keywords:  tbb-linkability, tbb-newnym, tbb-
   Resolution:           |  torbutton
Actual Points:           |  Parent ID:
       Points:           |
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Comment (by isis):

 Hmm. I tested on two machines, both of which were able to reproduce this
 issue, and both of which had:

 || '''Preference Name''' || '''Value''' ||
 || extensions.torbutton.block_disk || false ||
 || extensions.torbutton.saved.disk_cache || true ||

 Then I tested on a third machine with:

 || '''Preference Name''' || '''Value''' ||
 || extensions.torbutton.block_disk || true ||
 || extensions.torbutton.saved.disk_cache || true ||

 So it seems like, perhaps, if TorButton's `block_disk` patches are
 disabled, then FF writes the `nsIPermissionsManager` preferences to disk,
 and TorButton isn't able to clear them from disk, even when calling
 `nsIPermissionsManager.removeAll()`. Perhaps
 `nsIPermissionsManager.removeAll()` is broken?

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/12683#comment:5>
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