Solved Firefox 64 bit

I found a new Firefox version for 64 bit that just came out 4/12/14. Firefox 64bit x64 - 64-bit Firefox is now operational under x64 - Windows 8 Downloads I downloaded it but what I got says "nightly" and when I try to go to a site... the screen is blank. Actually after experimenting it's just the game sites on Facebook... Could it be it doesn't work with flash sites?????

"Nightly" means it is a development build, probably in a pre-alpha state - not ready for release as a beta, never mind to the public.

I would recommend against downloading software from sites like you've linked to, instead go back to the originating site, eg mozilla.org for firefox. Downloading second hand software is an excellent way to get your PC infected.

I uninstalled it. Firefox did not run properly on my 64 bit computer.