It is great on PC! Can it also work on Android Firefox browser?[feature request]

you are a saint for having made this. i been looking for something like this. and it works. thank you so much!

small suggestions for improvement:
- for it to remember the size and position
- the option to change the color of the bar and also to be able to set it non-transparent. in my case i'd make it black and not transparent so i wouldn't have to see the annoying flashes of forced subs.

thanks!