Mpg no longer open up in firefox browser...

A few months ago, every time i would open a mgp or mpeg video online, it would automatically open up in my firefox browser on another tab. All of a sudden, it will no longer do that and now everytime i click on a video, it opens up a small window saying "what should firefox do with this file?" and has Windows Media as the default "open with" choice. I put it on Quicktime and it opens it up in a Quicktime player. I dont want that. I want it to open up in Quicktime IN my firefox browser. I dont have a clue as to why it wont allow me to do that anymore.
Please help me out
Thanks

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