Ok I have a few issues going on. I have a 4 year old MBP. dual core ghz intel processors 3gb ram and 500gb hd. Running OSX.. Here are 2 of my issues. When i unplug my MBP fan goes on and it gets super hot then in about 20 mins just shuts off. 2nd issue. I am running latest version of Firefox. It crashes on my non stop. I have to force quit and re open and seems to run fine. IDK maybe its time for a new one but just don't have the dough. Anything I can run to clean things up and make sure its nothing software related.. Any suggestions would be super helpful.