Go to Adobe Labs: http://labs.adobe.com/downloads/flashplayer9.html

And "Download Installer for Linux (GZ, 2.48 MB)"

Then unpackage it via terminal or some other program

If you're using the terminal you type in:
Quote:
Note: Make sure you're in the right directory.

Then copy and paste the libflashplayer.so file into your mozilla plugin's folder, usually it's in your home folder, but you have to change your settings to view hidden files. On Ubuntu the folder you're looking for is ./mozilla/plugins/