You've certainly got me confused! I'm using Firefox to view your post, with no problems.
It might be worth resetting Firefox (rather than uninstalling/reinstalling). First go to Tools > Add-ons > Extensions and note down the names of any extensions that you want to keep (because you'll need to reinstall them after
resetting). Then go to Help > Troubleshooting Information and click on 'Reset Firefox' (at the top right of the page). That will put Firefox back to the way it was when you installed it (except that your bookmarks and other settings will be preserved).