To use these add-ons, you'll need to download Firefox.

Log in
Add-on icon

Reviews for 600% Sound Volume

600% Sound Volume by Aliaksandr

4.5 Stars out of 5
5
2,472
4
311
3
103
2
78
1
223
Review by Firefox user 17043639
by Firefox user 17043639, 3 years ago
works at intended. I use it often for YouTube music videos and it's great.