I have windows vista and hadn't seemed able to get full screen to work with u tube. I tried going to google chrome and then to the u tube page. Click on the icon in the address bar that shows www.youtube.com ( It's on the left next to the address ). This shows you view site information. Run you cursor error over each permission on the right. You are allowed to change each permission to allowed by you. I allowed by clicking on each one all but the: locations, notifications, mouselock, and media. When you are done, you may click outside of this box to have it go away. The you tube page will ask you to reload to have permissions take effect. After I did this I also went to the box to customize and control google chrome wich is way up in the right corner either having three small lines or may be a gear box. I clicked on this and went to tools and then clicked on extensions. It will show you google docs, mcafee, or whatever you have. I went down and clicked on get more extensions. This should bring you to chrome web store. The search is up on the left. type in : window expander for youtube and hit the enter key. click on add to chrome next to the window expander appliction. I exited out and went back to you tube. My videos play in full screen. Hope this can help someone.
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