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

Tor Bug Tracker & Wiki blackhole at torproject.org
Sat Dec 8 20:28:18 UTC 2018


#27503: Disabling accessibility on Windows breaks screen readers
-------------------------------------------------+-------------------------
 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:
-------------------------------------------------+-------------------------

Comment (by onionsoup):

 Replying to [comment:21 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?

 I tried all levels between 0 and 5 (the default), and accessibility seems
 to break at level 0, and doesn't work on any other levels.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/27503#comment:22>
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