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How to disable “YouTube.com is now fullscreen. Press Esc at any time to exit” message in Firefox

When you are watching a YouTube video in Mozilla Firefox, every time you switch to fullscreen mode, the browser shows the following message: YouTube.com is now fullscreen. Press Esc at any time to exit. If you are not happy to see this message, here is how to disable it.

Use YouTube without flash installed in Firefox

Being a Firefox user, you might face an issue that some videos do not play for you when you don't have Adobe Flash installed. Luckily for us, Firefox is an HTML5 compatible browser. Instead of installing Flash, you can tweak the browser and make YouTube work for you without Flash. To get it working, you need to enable the Media Source Extensions feature which is disabled by default.

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