Whenever I try to broadcast on TinyChat, the Adobe Plugin crashes..?

I used to be able to broadcast on TC just fine, but recently, I have downloaded and properly used ManyCam and used it on TC quite a few times without a problem. All of a sudden, whenever I try to broadcast on my regular webcam, after ending ManyCam completely, the Adobe Plugin crashes for the entire browser (TC, youtube, ads, games, etc) and when I try to open ManyCam on its own and turn on my actual webcam while using it, my computer shuts down. However, when I try to broadcast on IE instead of Firefox, it works just fine. How can I fix this?

I have already updated my Adobe Flashplayer.

My Webcam is built in and it's called HP Webcam [ 2 MP FIXED]

Thanks for the help :D