I would give this a 4.5. The only thing I would add is the ability to set it and forget it for a website. Most of the videos I've seen on youtube are too low of volume.

Not sure if its just me but keeps resetting to 100% from 600% every time page refreshes. Not sure if there is a way to prevent this.

it works and is simple

not working on most sites good when it works

It was loud, which is what we needed for streams that were too quiet. But then stopped working, tried removing and reinstalling but no good

I've used plenty of these types of volume booster add-ons and this one is the best one I've used.

Does exactly what it says. This is what I needed for the most. Thank you.

It is a really helpful add-on. Some YouTube videos are really quiet even at full volume, so this add-on comes in handy in these situations.