very
good

One of the best Youtube add-on available for Firefox.

I have used this add-on for quite a while, I redid my computer and formatted everything, so I had to redownload it. It's actually the second extension I made sure I got. I'm quite happy with how easy it makes doing things I've thought were missing from YouTube for a long time. However, like so many other developers they either don't even realize, or don't care, that in Canada, we speak Canadian English. Canadian English is neither British, nor US English. It may mostly sound the same, but it is actually a three-way mix. Little bits from British, little bits from US, and other bits are entirely Canadian. I'm not a developer, but it cannot be that difficult to add the languages spoken where you plan to market an item. There's always Canadian French, no one ever expects them to speak Parisian French, is it really too much to ask that when I hear or read something that has been marketed in Canada, that I am able to identify with the spoken and/or written word, not as British or US, but as ME. I AM CANADIAN =)

Love this extension, but also want to note that themes are a little broken at the moment.

Great extension.

Recently I experience strange behavior of the YouTube logo on the top left when using any colored theme. The color of only the first letter will change. For example, if my theme is mainly blue, only the capital Y is blue, the rest of the word ("outube") is white. I disabled other extensions, but I believe it's related to this one.

.

Nice functionality

cool

Very useful, and works so seamlessly that you forget it's there.

Youtube killed your extension man. Their awful interface is even worse now after getting used to your improvements.