How to solve no sound in flash videos ( fedora )

After installing flash-plugin-9.0.124.0-release.i386 rpm I just got the flash plugin in my firefox but didn't get any sound. Googling about it I found a solution that worked, you need to install libflashsupport rpm, restart firefox and that's it:

just type this:

yum install libflashsupport


I guess this may work in other red hat based distros.