Installed it and went to Youtube, had all other scripts disabled. But on tab change, nothing happens, the video doesn't pause :-(

Using FF 3.5.5 on Windows XP SP3 with latest Greasemonkey add-on. Did I overlook something?

EDIT:
Yes, I overlooked something. The link to turn on Autopause is under the search field on a video's page. I just didn't see it and Autoplay was turned off by default. The author already updated the script imemdiately on the same day to set Autopause to ON by default. Great!

Now it works and it's awesome! I was always annoyed when opening another video in a new tab having the previous one still playing and then getting a terrible audio mix :-D Now no annoyance anymore! This is definitely among my top favorite scripts!

Thanks a lot to the very responsive author!

Man this is the best script ever, 5/5 I Hope you make more YouTube microprograms....