[tbb-bugs] #16357 [Tor Browser]: Wipe permissions using Mozilla API

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#16357: Wipe permissions using Mozilla API
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 Reporter:  arthuredelstein  |          Owner:  tbb-team
     Type:  defect           |         Status:  new
 Priority:  normal           |      Milestone:
Component:  Tor Browser      |        Version:
 Keywords:                   |  Actual Points:
Parent ID:                   |         Points:
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 Mozilla accepted our patch from #2950 (a pref to make Permissions manager
 DB memory-only), with the restriction that the pref,
 "permissions.memory_only" be read only at startup. In torbutton, we use
 the pref at runtime, but this is unnecessary. To wipe permissions, we can
 call `Services.perms.removeAll();`

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/16357>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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