Comment 12 for bug 600548

I created a second profile to check if this would help. And in fact Firefox starts but I get a window with the message:
Could not initialize the application's security component. The most likely cause is problems with files in your application's profile directory. Please check that this directory has no read/write restrictions and your hard disk is not full or close to full. It is recommended that you exit the application and fix the problem. If you continue to use this session, you might see incorrect application behaviour when accessing security features.

My hard disk is not ful...