YouTube works on my end. At least the history videos do, anyway. Every so often, I may have to reload a page due to Adobe's Flash not working properly, but it is the fault of Adobe, Not Firefox or Mint. I have found that Firefox 3 is more stable with Flash than Firefox 2 was. I do not have any fancy 3D effects enabled, either. I use standard/solid/open-source drivers, and my video experience is more reliable than others I keep reading about. I just wanted to say that a standard install of Mint 5 with Firefox 3 simply works as it should.