I tried it on android cause firefox crops youtube videos. It crops the video too or show it in a stamp sized window in a corner of the screen.

cause is amazing

On android this extension only work when i switch back to desktop mode and then switch again to mobile mode
P/s : sorry my bad English :))

All the features you would actually want from "enhancer for youtube" but without the sketchy license and bloat.

thank, I hope the icon can show what the setting is.