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Intermittently Firefox 4.0.1 is crashing on Ubuntu 11.04 and logging out. Sometimes it happens if I open an arbitrary website such as http://www.omgubuntu.co.uk I am NOT streaming any videos. Please let me know how to solve this or at least reasons behind this.

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closed as off topic by Marco Ceppi Feb 6 '12 at 0:06

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1 Answer 1

I suspect it's an issue with your video card combined with newer Firefox technologies. Try turning off WebGL:

  1. Navigate to the URL about:config
  2. Search for webgl.disabled
  3. Make sure it's set to true (double-click on it if not)

If you want to debug the issue, you need to save the file ~/.xsession-errors before login again in the desktop:

  1. Switch to a virtual text console by pressing Ctrl + Alt + F1
  2. Login
  3. Copy the file: cp .xsession-errors name-of-desired-file
  4. Logout by executing exit
  5. Switch back to the GUI by pressing Ctrl + Alt + F7 (or F8 if F7 didn't work)
  6. Profit! (read the bottom of name-of-desired-file from step 3)
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