[tor-bugs] #27503 [Applications/Tor Browser]: Disabling accessibility on Windows breaks screen readers

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#27503: Disabling accessibility on Windows breaks screen readers
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 Reporter:  gk                                   |          Owner:  gk
     Type:  defect                               |         Status:
                                                 |  needs_information
 Priority:  High                                 |      Milestone:
Component:  Applications/Tor Browser             |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  tbb-8.0-issues, tbb-regression,      |  Actual Points:
  GeorgKoppen201812, TorBrowserTeam201812        |
Parent ID:                                       |         Points:
 Reviewer:                                       |        Sponsor:
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Comment (by gk):

 Replying to [comment:20 onionsoup]:
 > Hi! :)
 > Yes!! Flipping browser.tabs.remote.autostart to false solved it, both on
 the Tor Browser and clean Firefox. Now everything is accessible. Awesome!
 > Ah excellent, will do! :)

 Great! So, we are on the right track then. Let's try a bit more to narrow
 the problem down. Can you flip back `browser.tabs.remote.autostart` to
 `true` and restart the browser? Then look after
 `security.sandbox.content.level` in your `about:config`. Can you set that
 to `0` and the value you are seeing right now and restart the browser
 between every change (trying to figure out if the sandbox is breaking
 accessibility and, if so, at which level this is happening)? Does that
 already help? If so, what is the first sandbox level that causes the
 trouble for you?

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/27503#comment:21>
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