According to Macromedia Support, the mms.cfg is also backward compatible to version 7 of the Windows Flash Player.
Since Adobe offers two installers -- one for IE and one for Firefox -- I decided to make one package out of it for redeployment in my organization. With Wise Package Studio, it was a breeze, and now we only have to call one file.
WindowlessDisable=1 disables spawning Flash windowless
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