I GO THROUGH THE DOWNLOADING PROCESS OVER AND OVER, BUT THE NEXT TIME IT OPENS, IT SAYS I HAVEN'T DOWNLOADED
-> Uninstall your current Firefox as described in this article -> Uninstall Firefox from your computer
-> Download latest Firefox 12 from the following link using some other Web Browser:
-> Install Firefox 12 as described in this article -> How to download and install Firefox on Mac
Check and tell if its working.