When Flash 8 and 9 weren’t released for Linux, I thought, "why doesn’t someone just edit Flash’s code and change the 7 to a 9?" Turns out it’s possible. Here’s how:
1) Make a back-up of the file ~/.mozilla/firefox/pluginreg.dat:
cp ~/.mozilla/firefox/pluginreg.dat ~/.mozilla/firefox/pluginreg.dat.bak
2) Edit that file:
nano ~/.mozilla/firefox/pluginreg.dat
3) Replace the lines that say
Shockwave Flash 7.0 r63:$
to
Shockwave Flash 9.0 r63:$
Voila, you have Flash 9! (kind-of.) Enjoy.
http://xubuntu.wordpress.com/2006/08/14/flash-9-for-xubuntu/