Replying to NoPoles,something Strange

I'm using Mozilla Firefox and I was on newschoolers and looking around, everything was fine. All of a sudden when I clicked on any link or tried to go back to login screen, mozilla would open up the download window, saying I was trying to download the php file that the link refered to. I'm not sure if this was something only I experienced or what. Just thought I'd let you know
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I might be an adult, but I'm a minor at heart.