[tbb-bugs] #13072 [Tor Browser]: Reproducable bug: Tor Browser v3.6.5 gets into a non-responsive state on startup about 15% of the time, possibly due to the HTTPS-Everywhere plugin

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#13072: Reproducable bug: Tor Browser v3.6.5 gets into a non-responsive state on
startup about 15% of the time, possibly due to the HTTPS-Everywhere plugin
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     Reporter:  Gravitas     |      Owner:  tbb-team
         Type:  defect       |     Status:  new
     Priority:  normal       |  Milestone:
    Component:  Tor Browser  |    Version:
   Resolution:               |   Keywords:  tbb-hang
Actual Points:               |  Parent ID:
       Points:               |
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Comment (by Gravitas):

 > What happens with a vanilla Firefox 24.8.0 ESR which Tor Browser is
 using?

 With a vanilla Firefox 24.8.0 ESR which Tor browser is using, everything
 works perfectly. As described in the tests above, the hang on startup only
 occurs if HTTPS-Anywhere is enabled.

 > Hm... Have you made sure that Firefox was really shut down before you
 relaunched it? If so, how?

 Its not related to an issue with shutdown. Its related to an issue with
 startup.

 I just reproduced the issue again now, twice in a row:

 1. Started Tor browser.
 2. It hung on startup.
 3. I waited 2 minutes, then manually killed "firefox.exe".
 4. I waited 1 minute.
 5. I started Tor browser again.
 6. It hung on startup.
 7. I waited 2 minutes, then manually killed "firefox.exe".
 8. I waited 1 minute.
 9. I started Tor browser again.
 10. This time it worked.
 11. I then disabled HTTPS-Anywhere, and restarted it 25 times in a row,
 and it started perfectly every time.

 I don't think this issue can be reproduced unless you have an extremely
 fast machine. My machine is a Xeon with dual CPU's with a total of 12
 processing cores. The system is fantastically stable, and has no issues at
 all with any other programs.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/13072#comment:8>
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