Everything is trying to open via firefox...

Hello,

... or something. Yesterday I tried opening something and that little thing came up saying windows doesn't know what program to use select from this list or look online, you guys know the message. So I picked firefox because I thought it could be opened online. It didn't work, but I got that problem fixed. My problem now is that everything has a firefox icon on it, google chrome everything, and when I open anything, it goes to a new tab on firefox and says you have chosen to open a binary file, gives the location and asks if I want to save it.

Anyone know how to fix this?

Thanks