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.

it works and is simple

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.

Perfect to use with youtube music or any other web based music player.

recommend it