Iceweasel upgrade and flah sound?

[Dept <ratta1i@cps.cmich.edu>]

I just upgraded to firefox 3.01 under Linux 2.6.25 and lost the sound in 
flashplayer. The file libflashplayer.so is in the right directory 
/usr/lib/iceweasel/plugins.

Is there a way to go back to the previous version of firefox?

-ishwar