[tor-bugs] #22560 [Applications/Tor Browser]: Update privacy.thirdparty.isolate preference in Torbutton

[Tor Bug Tracker & Wiki]

#22560: Update privacy.thirdparty.isolate preference in Torbutton
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     Reporter:  gk                        |      Owner:  tbb-team
         Type:  defect                    |     Status:  new
     Priority:  Medium                    |  Milestone:
    Component:  Applications/Tor Browser  |    Version:
     Severity:  Normal                    |   Keywords:  tbb-7.0-issues
Actual Points:                            |  Parent ID:
       Points:                            |   Reviewer:
      Sponsor:                            |
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 `privacy.thirdparty.isolate` is gone with the switch to ESR52, yet we
 still try to use it in Torbutton. We should get rid of the preferences in
 `torbutton_update_thirdparty_prefs()` that we don't need anymore and adapt
 `privacy.thirdparty.isolate` for the remaining ones (it is
 `privacy.firstparty.isolate` now).

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/22560>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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