I had problems using youtube in full screen mode jittery and jumpy. I tried numerous solutions I found on the net. I did so many things I can't remember them all but youtube is working great now with one exception. I bring up a youtube video and it won't play and no sound UNTIL I hit the pause and then play again and it starts right up and plays perfectly in full screen mode. Seems this problem(s) started either with a Firefox upgrade or using the new HTML5 format. Seems Internet Explorer works properly so why am I complaining? I like my Firefox with DuckDuckGo overlay. I have a good system image in case some or all these problems reappear. Anyone experience anything like this? Sorry if I haven't given enough or proper problem info and complete list of what I did to help original problem. Thanks in advance.