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73416ba
(Get the code!)
I have seen this several times since reporting the bug. It does seem to occur when Firefox is upgraded while it's still running.
I haven't tried to reproduce it, but in general, surely assertions should not be used to check for missing files? An assertion should be an impossible, 'cannot happen' condition based on program logic, not something that checks the state of the world external to the program. After all filesystems can be unmounted, files can be deleted, and while this is certainly an error condition it is not an impossible condition.
I suppose you could talk to the Fedora guys about what is the supported way to upgrade Firefox, and if the user should be prompted to restart the browser when a new rpm package is pushed out.