For some reason, when I try to play an mp3 file (or .wav or .m4a etc.) within firefox 4.0.1 using the quicktime 7.6.6 plugin (by typing in the URL or clicking a link), half of the time it will play it in-browser as I want, and half the time the screen will be blank and a quicktime popup will appear saying I need to install "additional components" and that I should go to some webpage to find what's needed to play the file. Aside from the fact that it only happens half the time (and I can get both results--"play" and "need additional components"--with the same file at different times), it's ridiculous because as I mentioned, the files I'm trying to play are mp3, wav, m4a, and other very common extensions. There's no reason to need additional components. In addition, I can receive the "need additional components" message while a friend I'm chatting with can play the song file like that *snaps*. So first FF4 breaks the in-browser pdf plugin, and now I'm getting this. I can't find a solution for the pdf thing, but hopefully I can get this fixed. *sigh* Anyway, thank you very much for any help!