So your problem is that nothing at all happens -- you click the file and it behaves as if you didn't click the file?
Which means we're back to my previous questions -- do you have something like mozplugger installed (check about:plugins), or do you have an action defined in one of the mailcap files (grep gsm /etc/mailcap ~/.mailcap)?
(Are you actually interested in fixing this or just complaining about it? I'm trying to help but you're really not giving enough information for me to provide any useful advice).
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