Whilst this "How To" is aimed at the Adobe Flash plugin, there is no reason why it cannot be extended to any application. As I have previously mentioned, using the Package Manager is the easiest way ...
I'm running Win 7 x64, Firefox 10.2, Flash Player 11 Plugin 64-bit 11.1.102.63. I did a manual install via Adobe's site but Firefox continues to claim the plugin has not been installed. Auto install ...