Today Firefox started acting up on YouTube. I couldn't use pause or play buttons. I rebooted my computer (though Safari works fine), I force quit Firefox and restarted it. No dice. I finally removed it from my Macbook Pro and redownloaded it. But it obviously wasn't a fresh copy because it still had all my bookmarks and extensions included. It worked for a short while and then started acting up again. I don't have any new extensions so I'm not sure what's causing the problem. Since it seems corrupt, I don't want another copy of what I already have on my current Firefox App. I want to start over to see if it works better. I would like to know how to do that since deleting the app and redownloading didn't give me a fresh app without all my other stuff included. Any help would be appreciated. I found a great video addressing this but it was for Windows so I couldn't apply the info to my Mac. I checked my history but couldn't find that video which may have helped someone with Windows. Grrrr!