Comment Meh, not a big deal (Score 1) 364
I roll my own Windows builds of Firefox and have been using Win64 versions since before FF4 actually came out; the difference is really minimal; I use 64-bit Flash (square) and Java, everything works and it's native.
Currently there is a patch in the works to enable Firefox x64 to use 32bit plugins via the wrapper, which I get the feeling will probably encourage Adobe to not bother releasing a "proper" x64 Flash.