There’s a good chance if you did a clean installation of 64 bit Fedora 12 Constantine that any Flash web content won’t flash – pun intended.

A quick workaround for this is to download the latest 64 bit Flash Player for Linux:

http://labs.adobe.com/downloads/flashplayer10_64bit.html

Extract it:

Restart Firefox, and confirm plugin installation by typing this into the address bar (look for “Shockwave Flash” section):

about:plugins

Enjoy Flashy web content.

Download.