I re-installed my os and unfortunately everything else on my computer disappeared. Is there any way to recover the last profile I had with firefox.

Did you ever create any backups of your computer? Did you ever set up the Firefox Sync service? You might be able to get some data back if you immediately try an unerase tool like the following: https://www.ccleaner.com/recuva Unfortunately, the odds of success are not very high. Here are some files you might be able to find: [[Recovering important data from an old profile]].