i went to the mozilla site to update the firefox and it came out in arabic.
Answers:
You probably got the wrong update. You might download the newest version from their website. This will include all updates and will ask you which language.
NO WAY U PLEASE REINSTALL IT!!!!
DONT TRY TOO MUCH!!!!
IT WILL LEAD TO DAMAGE IN UR SOFTWARE OR UR SYSTEM!!!
OK FRIEND BYE!!!