Load up “about:crashes” and make sure at least one of the crash reports was submitted. Then click the link to view the report; it’ll show you the stack trace, w

Load up “about:crashes” and make sure at least one of the crash reports was submitted. Then click the link to view the report; it’ll show you the stack trace, what libraries were loaded, all kinds of information. You can use that, in combination with the Firefox source, to diagnose the crash and figure out why it is happening.