[tor-bugs] #12941 [Tor Browser]: Firefox is already running.

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#12941: Firefox is already running.
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     Reporter:  mttp         |      Owner:  tbb-team
         Type:  defect       |     Status:  new
     Priority:  normal       |  Milestone:
    Component:  Tor Browser  |    Version:
   Resolution:               |   Keywords:  tbb-helpdesk-frequent
Actual Points:               |  Parent ID:
       Points:               |
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Comment (by mikeperry):

 I just hit this on 4.0-alpha-2 on Linux after a laptop crash while the
 browser was open. I needed to remove
 Browser/TorBrowser/Data/Browser/profile.default/.parentlock and
 Browser/TorBrowser/Data/Browser/profile.default/lock. There might also
 have been some weird interaction with my apparmor profile too.

 I am wondering if we can read the lock file, extract the PID, check if it
 is still running, and if not, simply remove the lock files? We could do
 this in either Firefox proper, or the wrappers. Kind of surprised Firefox
 doesn't already attempt this check.. Maybe it does on some platforms, and
 maybe my apparmor profile issue was just blocking it this time.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/12941#comment:9>
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