SalamuAlikum,
Let me bring your kind attention to vote for Arabic Mozilla bug # 82383
at http://bugzilla.mozilla.org. There are currently 3 votes (last time I checked).
Maintainers would not pay attention to the bug (Arabic shaping) if there
are not enough votes. Kindly take few moments of your time and vote for
the bug to be fixed and we all can enjoy Arabic Mozilla.
Best regards,