I can’t watch YouTube videos fullscreen on Firefox Lite

Firefox Lite Firefox Lite Last updated: 06/01/2021

Starting on June 30, 2021, Mozilla will no longer support Firefox Lite. This application may continue to work on your device, but it will no longer receive support or security updates. For more information, visit End of support for Firefox Lite. Download Firefox for Android or Firefox Focus for a fast, private and safe browsing experience.

If you’re unable to watch YouTube.com videos on fullscreen mode while using Firefox Lite, that’s because there is a known issue with Android WebView which handles the way apps like Firefox Lite load web pages.

Android System Webview is pre-installed in most Android devices but might not be automatically updated.

On Android 7 and later

Google Chrome 51+ and WebView are packaged together in this version. Updating Chrome will also update WebView.

  1. Visit the Chrome page on the Google Play store.
  2. Tap the button to download or install the update.

On Android 6 and earlier

This has been fixed in an upcoming version of WebView (74.0.3729.108) which will be released in the Google Play store. When the new version of WebView is released, update your system software and Firefox Lite to get the new fix:

  1. Visit the Android System Webview Google Play page.
  2. Tap the button to download or install the update (please make sure it’s version 74.0.3729.108). You can see the version number by scrolling down the Google Play page to Additional information.

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