Full user review
"Does not work with Vista Home Premium / Firefox / Flash"
It's a small download and quick install
It doesn't mute flash on my system: Windows Vista Home Premium / Firefox 3.6.6 / Flash 10.1
The program needs an update, I used to have it on my old XP system and it worked fine but sadly not any more....
At the present time (July 2010) the FlashMute Addon for Firefox does not work with the current Issue of Firefox/Flash
The only option I can find to mute flash in FF is the hack of adding a blank text file in to the Firefox program folder (normally C:\Program Files\Mozilla Firefox) and re-naming it to 'msacm32.dll' but this mutes ALL flash (including YouTube etc.) and you need to re-name or delete the file and re-start Firefox each time you want to un-mute.
Really Adobe needs to address this and add a universal Mute function to Flash