Mobile Firefox will not always disable the display timeout when a youtube video is ending. By exiting fullscreen automatically you can fall asleep watching a video without your phone battery being drained over night.
The extension checks if you have "autoplay" enabled and will not exit fullscreen if so.

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• License: GNU General Public License v3.0 or later
• Weekly downloads: 0
• Average daily users: 2
• Rating: 0/5 of 0 ratings
• Created: 2022-05-17 20:20:06
• Last updated: 2022-05-18 14:36:30
• Homepage:
• Support site and email
• Orig: https://addons.mozilla.org/en-US/firefox/addon/youtube-exit-fullscreen/
• API: {5f4b2782-e884-4714-84c1-4ca368505524}