when i install firefox on my g4 it starts to turn of by itself
Welcome to the Computing.net Mac forum! :) What are you trying to do? To install Mozilla Firefox on OS X (not "foxfire"--I believe you're getting it confused with "Skyfire" on iOS), you should be able to download the disk image, mount it, and drag the Firefox app to the Applications folder.
Your Mac should not be turning off during a simple copy. Is there anything that I'm perhaps misunderstanding with this issue? If so, please let me know, and I'll get to your question as quickly as I can.
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