Well my browser is working much better now. I was having a very sluggish experience online for a few days, but refreshing the browser fixed it. One of the add ons must have been messed up, or had a bad update.
Yah though it turns out that it was one of the YouTube one's that caused the issue as I tried adding it back, but its completely broken. Likely caused by a update YouTube has made to its layout, or Firefox, but I'd put my money on YouTube as they doi little stupid changes all the time like that.