Works straight out of the box flawlessly. Nice to see that it's FOSS and I hope it stays that way.

Hats off to the dev for his work, you're awesome! Also, the fact it runs on a "visit" basis makes trusting it even easier. Didn't have to enable the optional option.

Writes up and down for each tab

Works as described. I'll never understand why certain sites (like Bandcamp or Patreon) don't have an on-site volume slider for their music widgets and instead just blast you at full volume... Being able to adjust the volume down per site/tab is just perfect and way better than having to temporarily turn down the volume for the whole browser instance. The FOSS nature and minimal permissions are the cherry on top that make this a perfect choice :)

Best sound booster!

Get this extension! It is excellent! Here is why:
- works perfectly
- open source
- streamlined
- contains extensive documentation
- minimal permissions required to function
- the developer is very active (see other review for his/her responses and fixes)

There are many extensions that provide volume boosting functionality. The ones I have tried are completely untrustworthy. The main issues I have are things like: ad injection, NOT open source, pure copycats of other extensions, and so forth.

Pretty much the best Volume Controller in Firefox that I've found while also being pretty lightweight and straightforward.

after giving permission to access the data on visited websites it's working fine. Simple but great extension

The sound on Netflix is far too quiet; I guess they want your volume up as much as possible because they like to have sound that's both very loud and very quiet? Probably fine with headphones or a good sound system, but the maximum volume on my gaming laptop was not enough for me to be able to hear well (And I'm 25!)

This extension works perfectly! Thank you to the author!

Doesn't work on https://web.whatsapp.com/ :(

OUTSTANDING!
Others were silent/muted, but this one works well.

Runs very well for HTML5 video. Clean and Light. Thanks for creating this extension! Very useful!

works perfectly. exactly what i wanted, a no-nonsense extra volume slider. i have issues with audio sensitivity and being able to make things as quiet as humanly possible is a godsend.