Excellent. Loved this adon with Windows, and I've since switched to Mac OS and I love it on here too! Has so many personalized optional settings that I believe are really overlooked by YouTube. They have done a fantastic job of making your YouTube browser personalized exactly how you wish it was and prefer it to be! And it works 100% of the time. I've never seen this adon fail once and I've been using it daily for over a year now on Windows and for about a month on Mac OS. Highly recommend for avid YouTube watchers.

One caveat I wish to mention, is I wish they would include a record button in addition to the screen shot button that recorded video AND sound. That is something I think is lacking everywhere. Not even apple has one that includes sound... Only video w/o any sound... :/ Would be a huge plus if you guys added that into the optional button bar!!! <3 Love what you guys have done Devs <3 keep killin it!