I've noticed that none of the drag controls work with the combination of Firefox 3 Mac (10.6.8) and Flash Player 11. I'm seeing the same problems with some of the sample apps on the Tour de Flex site.
For example, go to the Tour de Flex site (http://www.adobe.com/devnet-apps/flex/tourdeflex/web/)
Then go to Flex 4 > Components > Controls > Slider. I am not able to drag the slider when using Firefox 3 on Mac and Flash Player 11, but am on other browsers as well as in Firefox 4 and later.
Has anyone else seen this problem? Is it something that might be fixed or is Firefox 3 too old to bother with at this point?