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
1,480
4
203
3
57
2
50
1
110
Review by Firefox user 12225282
by Firefox user 12225282, a year ago
Not work on open.spotify. Unknown .js script in code.