Yep. Perfect. Exactly what I needed for youtubers who for some reason used 2 channels when all they're doing is talking.

best

Brilliant add-on! Too bad it doesn't remember the sound preference :(

Really useful add-on. My master volume is already reasonably high, but some videos and streams are still too hard to hear particular when I have a fan and A/C running in the summertime.

The addon works but you have to adjust the volume on every video, it does not keep the settings

This add-on only reduced the sound or returned to sound that is too soft for me to hear comfortably.

I have to give this one star because I have no idea how to use it and there are no instructions here. I'm more than competent with computers and I use Youtube very regularly, but after installing this and restarting Firefox, there's absolutely nothing new on Youtube video pages to interact with to use this addon.