I've uploaded flash-player-plugin-9.0.21.55 (libflashplayer.so) at uploadmirrors here.
This is an old one, as a result, no NGC video, enlarment screens, Hulu, yahoo video on popurl or metacafe site,
however, you can click metacafe small video on popurl and watch a vignette.
inbed to
/usr/lib/iceweasel/plugins/
or
/usr/lib/mozilla/plugins/
or
/usr/lib/mozilla-firefox/plugins/
Make a readme for your self.
It's for the 5.0.1, BTW.
enjoy