This works well for me in the latest Firefox update.

Good app. Sounds clear

i love whoever made this, i have never had a more useful extension

just does what it's designed to do

Super schön laut

perfect for my extremely quiet lecture recordings!

awesome app

I only wish you could make the 600% the default setting. Youtube has a new option that has completely destroyed sound quality. I have to max out your app to even hear youtube channels. At 600% it takes back control. It really is a wonderful and annoying app. I have to keep turning it up to 600 several times while using the youtube app. I appreciate this app nonetheless. :)

классно, круто, а главное удобно )))
Рекомендую, ибо иногда прям очень очень тихо что-то воспроизводится, а тут просто ползунок передвинул и всё уже слышно ♥

c'est bon

Game changer! So many shows are very hard to hear. This makes for a booming soundtrack, as loud as you need. Fantastic add on

Currently doing a 2-month long online course where the instructor speaks very softly. With this add-on I can turn up that tab instead of having to adjust my volume up/down multiple times a day based on what I'm doing. Also no more forgetting to lower system volume and getting blasted with sound when I open a game.