You may also use some YouTube-related extensions for certain purposes. You may have installed several extensions for your browser to achieve some tasks. Update Browser to Fix YouTube Fullscreen Problem Fix 2. After all is done, please restart your browser and play YouTube videos in fullscreen mode again. Visit and follow instruction to download and install the newest Flash Player version. It's better to keep Flash Player for Chrome, Firefox and other browsers up-to-date. You can open to confirm that "HTMLVideoElement" and "The HML5 player is currently used when possible" options are checked.Īpart from browsers, Flash Player may cause various YouTube playback problems as well. No matter which browser you're using, update it to the latest version with the support of HTML5 player to avoid fullscreen problem when playing HTML5 video on YouTube. YouTube fullscreen not working on Safari, Chrome, Firefox, or Edge is a known error. Update Browser & Flash Player to Latest Version Fixes to YouTube Fullscreen Not Working Errorįix 1.
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