When Firefox crashes, it generally records data about what it was doing just before it happened. If you submit this data to Mozilla, you can post a crash ID here so a volunteer can take a look. Hopefully that will provide insight on some new approaches to resolving the problem. This article (last section) describes how to find the crash IDs: Troubleshoot Firefox crashes (closing or quitting unexpectedly).

There are other things that need your attention.

Note that your System Details List shows that you have a user.js file in the profile folder to initialize some prefs on each start of Firefox.

The user.js file is only present if you or other software has created it, so normally it wouldn't be there. you can check its content with a plain text editor if you didn't create this file yourself.

The user.js file is read each time you start Firefox and initializes preferences to the value specified in this file, so preferences set via user.js can only be changed temporarily for the current session.

Your System Details List also shows that you have obsolete, no longer supported, preferences from previous Firefox versions.

You can delete the prefs.js file and possible numbered prefs-##.js and user.js files to reset all prefs to the default value.

• http://kb.mozillazine.org/Preferences_not_saved
• http://kb.mozillazine.org/Resetting_preferences