When I try to watch a You Tube video Firefox locks up or freezes. Then I have to open up Task Manager to get it to shut down. Very annoying. It doesn't matter whether I click from a link to go to You Tube or go there directly and try to find a video. Firefox locks up either way. I can use other browsers but Firefox is my browser of choice and I always forget to use another browser until it's too late. How can I fix this?