Greasy Fork

Great! One that works. However, two tiny suggestions:

1. Add "*://" in front of the match patterns so this works with ViolentMonkey
2. Make the button smaller and in the right sidebar so it doesn't cover up the progress bar. Maybe even integrate it into the right sidebar so I don't have to hack windows to keep the window always-on-top.

Would be really nice if this script also supported seeking in the progress bar, so that I can work around the annoying bug on Firefox where playing will invariably get interrupted at a randomly specific point in the middle of a video.

The new update has the first sugestion but It is hard to implement the second one due to how the button is injected

Maybe make it have a min-content width and floating to the right?