This teaches you to change your flash player 7 on Xubuntu to a flash player 9. Its small, and really easy to do.

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:$

And you have Flash 9 (kind-of.)