Do not automatically loop videos on twitter (when they're under 60s). Didn't test with autoplay. Disable autoplay in twitter settings if it doesn't work
< Feedback on Twitter do not loop videos
Also maybe an idea to switch from checking for all video elements 10 times per second to a MutationObserver?
Useful script! Any chance you could make it so that there's an option to only stop videos from looping but still loop gifs? I couldn't really find an easy way to distinguish the two in the source code since gifs on Twitter are just videos as well.