[tor-bugs] #30832 [Applications/Tor Browser]: Fix tor-browser tbb-tests for ESR68

[Tor Bug Tracker & Wiki]

#30832: Fix tor-browser tbb-tests for ESR68
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     Reporter:  acat                      |      Owner:  tbb-team
         Type:  defect                    |     Status:  new
     Priority:  Medium                    |  Milestone:
    Component:  Applications/Tor Browser  |    Version:
     Severity:  Normal                    |   Keywords:  ff68-esr
Actual Points:                            |  Parent ID:
       Points:                            |   Reviewer:
      Sponsor:                            |
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 With current rebased tor-browser ESR68 branch I can only run tbb-tests
 (with `run-tbb-tests` script) when `pref("network.file.path_blacklist",
 "/net")` is removed and `pref("extensions.torbutton.use_nontor_proxy",
 true);` is set, apart from disabling tor-launcher. The second pref
 disables the domain isolator, which makes sense since it expects SOCKS5
 proxies, but mochitests override that. For the other pref, not sure why
 `network.file.path_blacklist` needs to be unset (at least for Linux).

 We could put these prefs in `testing/marionette/prefs/marionette.js` so
 that tests can be run (unless there is a simpler way to get the tests tor
 run that I'm missing).

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/30832>
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