Hi Gary
the flash plugin now has it's own slider in the system volume mixer - shown below for windows 7
you can either mute it or take down the volume or separately, and with firefox it appears to hold the setting when closing and opening the browser, but needs resetting if the computer is rebooted
[not tried this in any other browser, and it's possible your sound card/system may differ]
I right click on the speakers icon in the systray to get the mixer from menu - alternativly 'control panel /sounds/ adjust system volume' should take you there in win7
EDIT ADD: it won't hold the setting if you close down the browser completetly....
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