Good idea but doesn't work on most tabs. Even after refreshing the page, the add-on doesn't apply to the page.

Worked sometimes but has given up the ghost and virtually mutes the sound now.

didn't work whatsoever. changing volume would permanently mute whatever I was trying to adjust.

Great to boost the volume of individual tabs

It is stupid that you can't set a default volume and amplification! Every single time I have to manually adjust it! Why?

Doesn't work at all

Most of the times works fine (sometimes it has no effect in the audio), I only use it to amplify volume in youtube.

The only thing that keeps this from being 5 star is that it causes playback speed, which I usually set at 1.25 or higher, to default to 1. Other than that it's the best I've found for listening to too low volume youtube broadcasts and the only one I've found that works well with hoopla.

Não funciona. Mexo o volume e não muda nada.

Doesn't work for Instagram. Just disables audio completely regardless of what values are set. Seems to be Instagram-related rather than this add-on as there are others with the same effect. Still - it means there are scenarios where this add-on is not fit for purpose.

Did not work. Too many bugs.

I did not get the effect I wanted, because this extension does not work with the language learning site Duolingo. It can only work with Facebook, HTML5. That's why my neighbours had to listen to people shouting in Spanish while there were quiet sounds of nature playing in the background. p.s. yes, default volume 100% please, not 10%. Somebody, please, make an extension which can change volume for any tab and any sound source, not only HTML5.

Doesn't do anything on Developer Edition 75.0b10

Cool addon, but please make default volume 100, not 10. Every time i want amplify sound i have to set volume back to 100, its annoying.