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
2,475
4
312
3
103
2
78
1
223
Review by Firefox user 16607379
by Firefox user 16607379, 4 years ago
this is just what I need to hear lots of videos online. thank you.