Have had zero issues with the tool, very useful, and never fails.

I installed this to boost the volume in YouTube. And this add-on is full of features. I highly recommend it.

One of the best extensions for you tube out there. Would love to have it available for Chrome as well, but couldn't find it on Chrome extensions store.

Volume controls need to be page-global instead of video-focus, speed controls don't work in full-screen player mode.