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Preview of YouTube Fullscreen Fit

YouTube Fullscreen Fit by Dinoosauro

Make the YouTube player fit all of your screen when opening fullscreen mode. NOTE: After installing, click on the extension and grant the authorization to access YouTube

Available on Firefox for Android™Available on Firefox for Android™
4.2 (23 reviews)4.2 (23 reviews)
992 Users992 Users
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Extension Metadata

Screenshots
Screenshot of a YouTube video before applying the extensionScreenshot of a YouTube video after applying the extensionQuickly change mode from the player: if the video is zoomed, go back to its original size; if the video has the original size, zoom itThe extension UI
About this extension
This extension permits you to make every YouTube video completely fit your screen when opened in fullscreen mode. Works with every aspect ratio.

From the extension settings, you can choose if you want to automatically enable the extension, or if you want to stretch the video instead of zooming it (and keeping the aspect ratio). You can always enable/disable the extension from the buttons at the right of the YouTube player.

NOTE: After installing, click on the extension and grant the authorization to access YouTube. Otherwise, the extension won't be able to resize the video.

This project is open-source. You can see the source code at: https://github.com/Dinoosauro/youtube-fullscreen-fit
Rated 4.2 by 23 reviewers
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Permissions and dataLearn more

Required permissions:

  • Access your data for sites in the youtube.com domain
More information
Add-on Links
  • Homepage
Version
1.7.2
Size
35.65 kB
Last updated
a month ago (9 Jul 2025)
Related Categories
  • Photos, Music & Videos
Licence
MIT Licence
Version History
  • See all versions
Tags
  • youtube
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Release notes for 1.7.2
  • Fixed a bug where the "fillHeight" option (the one that permit to fill the screen only if there's a bar in the top/bottom or in the left/right) didn't work on Firefox mobile
  • Settings change are now applied immediately in the main script
  • Added a version string in the UI
  • Layout fixes in the UI for the Select width
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