Does Unity Web Player works on Windows 10 x64?

I had recently installed in my pc, the latest version of Windows 10 (x64), downloaded directly from microsoft website, and also installed the latest version of Mozilla Firefox 46.0 (x64), and, for some reason, a cant make Unity Web Player to work!
I had installed it many times, the instalation goes fine, without any error, but the browser keps asking me to do it again, when i try to play a game using it.
I upgraded from Windows 8.1 (x64) and Firefox (45 something) (x64), and everything was working fine.

Unity web plugin (and many other “old” plugins) are only supported with Firefox 32 bits, not 64. You can install Firefox 32 on a Win10 x64 machine, it works well.