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I don't know if this is what 'texmex' is refering to but it might be a Ram issue as firefox is heavy on and that might cause a problem if yours is spread thin. You could try Opera that uses less and is free.
Start up firefox from a terminal emulator on your desktop, and see if you get any informative messages before it crashes. In all likelihood you'll at least be able to do a web search for the message, and see what others have come up with.