I use another sound booster which works on videos, but won't work on audio pages like Bandcamp, Soundcloud etc. So was looking for a booster, like the old one this is made from (I think!) that works with audio pages too. Unfortunately this crashes Bandcamp and the audio stops playing.
Also, the volume doesn't change while you are sliding it, only after release your mouse left click button. I prefer to hear the changes while it's sliding.

it doest work on live streams using the alternate player for twitch

Works as advertised. Can't confirm the claims of no ads or tracking though.

you change the volume and it always resets to 100% idk what the problem is.

The video doesn't load if you change volume.

The only one of those actually working reliably. Thank you for fixing the "original" one.

Вконтакте - не работает

Mostly does what it's supposed to, but unfortunately crashes some video players instead of boosting volume. Fine for YouTube use.

old and buggy interface, does not save position.
старый и глючный интерфейс, не сохраняет позицию.

Works on YouTube and other video streams just fine, but completely breaks on Bandcamp (including embeds). Really hope this gets ironed out soon, given that—salient privacy issues aside, of course—the previous app worked so well across the board.

Thank you for this, truly. Removing the ads/tracking from the original is good, making it open source is great.

Works great for me, better than the original without the deceit. Even get to pin it to the toolbar now. Thank you!

Does not work at all. Also it is the only add on/extension I've ever come across in over 20 years of using Firefox that will not pin to the toolbar.

works great when some youtube video has ultra low volume for some reason