Okay, I'll just download the latest version. I should have had a look around before making this thread, but I was tired.
Thanks.
Edit: I just downloaded the latest Quicktime, but it still doesn't work in firefox. *Edit again* It wasn't that firefox couldn't detect Quicktime, but the settings in Quicktime were "wrong". I just went through the preference list and ticked everything
Problem Solved.
/ 
