It doesn't work the way it should. There is no way to make it set a tab's volume and have it STAY at that volume. It has the ability to adjust a tab's volume, but the tab has to already be playing sound for it to work. For example: Reels on Facebook are insanely loud every time you go to the next Reel, even if you adjust the volume down to 10% with the add-on. You have to go to the next video, then open the add-on and adjust the volume for each one.