Rated 5 out of 5 stars
Great addon. One of my essentials since FF 1.3 (old times...). :-)
Just to let you know, the white-list was also not working for me at least in youtube. In my case I found the source of the problem in one of my Greasemonkey/Scriptish scripts: Youtube Center.
Changing one option of this script (Flash Mode) from "Clone" to "Src" solved the issue. Hope this may help somebody.