Not sure if this will correct your issue. If it is in the scripting for the language it may but it is more for the ability of the program to accept add ons when using Ubuntu.
https://bugzilla.mozilla.org/show_bug.cgi?id=433371
then reinstall using the arabic version 3 without uninstall of the previous verison.
http://www.mozilla.com/en-US/firefox/all-rc.html
Ubuntu is still a bit behind in the firefox deployments but they are coming.
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