Sorcha, I found this statement:

When selecting the file types you want Quicktime to handle under "Mime Settings", make sure that "Flash File", under miscellaneous, is not enabled. This will cause a conflict with the Macromedia Flash Plug-in and flash files will more than likely cease to play.

here.

http://forums.mozillazine.org/viewtopic.php?t=206210


I've been having some problems myself trying to get all the bells and whistles using Firefox. It seems that Micro$oft makes it difficult to use other things with Windows. Also, that QW@#$%^&P) RealPlayer really messes up other things.

My favorite piano midi files had to have Crescendo in order to hear them. I don't know what I'll do about that. I think I found an old version of Crescendo that can still be used.