Hi there just switched to firefox due to some unfixable bugs in Edge, but i'm missing a key feature: in edge i had the following add-on : Volume master, which turns the volume up to 600%, however it has a quite handy bug: whenever you change the volume with add-on and then try to full-screen the player, instead going full-screen, it becomes full width theater mode player. is there any such add-on for firefox?

adding images as an example.