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.)
Are you sure that this is of any help?
I did the changes as outlined and it just helped my Firefox to crash on Debian unstable whenever I access a flash site…