After re-installing Ubuntu (14.04) Firefox crashes every time I turn it on. I open it, it crashes, reopens and then works. about:crashes says always the same, that there was a problem with libgstflump3dec.so module.

So, I already installed: libgstreamer0.10-dev, libgstreamer-plugins-base0.10-dev, ubuntu-restricted-extras and gstreamer0.10-ffmpeg from ppa:mc3man/trusty-media (the last one as described in here), but none of this helped.

Another thing I already done is apt-get purge firefox and then reinstalled it - also with no luck.

Do you have any ideas on what could be wrong and how to fix it?


If it's not a bug of the firefox version you've installed (is it from a regular/official Ubuntu repository, or an odd custom PPA?) then it's most often a firefox profile problem.

Try these instructions to start in "Safe Mode" with all addons disabled
(Basically open the Help menu and select "Restart with Add-ons Disabled...")

Then proceed with the troubleshooting options on the above website:

  • This instructions need Firefox running. Firefox doesn't start correctly and crashes. – userDepth Nov 15 '15 at 16:38
  • @user3005629 That is correct, this question is about Firefox crashing, re-opening and then working. Yours is a different question. But at any rate, if you wanted to try using a different profile with your Firefox that often solves lots of problems. Try starting it with firefox -p and create/choose a different profile. – Xen2050 Nov 20 '15 at 15:41

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