Edit:: The problem is the setting "Use hardware acceleration when possible", unchecking it lets it run in the browser. Does that mean my video card is going bad? I've got a bug generating a tilemap for html5 canvas games. I can generate maps 500x500 tiles (250k tiles total!!) in '''every browser except firefox''', which chokes at 10,000 tiles ('''25x less than every other browser '''including IE, Safari, Chrome, and even Opera....) '''Even my 3 year old HTC android phone loaded a 500x100 tile map which is 5x larger than the largest map Firefox will load on my DESKTOP!!!..........''' Here's a version my phone and every browser except Firefox can load: http://simplehotkey.com/Tiles/main.html If this isn't fixed I will have to force users to install Chrome Frames when it comes out for FF and Safari to access my games.........which is coming out soon.......as a means of enforcing a certain level of performance.......otherwise Firefox will be the only browser I have to drop support for..... I've been a huge fan of FF for years, but this is serious, my old phone can generate maps more than 15x larger than my desktop can with FF, that's unacceptable.