Firefox closes immediatly after opening on MAC

i have a imac that i have used firefox on since i purchased this. Out of no where i open firefox and it immediatly closed?? i tried again and nothing worked. I have since tried every "fix" posted - nothing works! - i have removed ALL traces of it, moved the plist file deleted the plist file - downloaded ver.4 - DOES NOT WORK - yet safari and camino ( which i downloaded after just to try ) work fine. Camino is made by mozilla go figure? - also on my macbook firefix works fine - both OS's are the same - they have the same AV with all the same updates? does anyone have ANY idea what can be causing firefox to work - when it used to for over a year with no problems - its not that big of a deal - its principal at this point - oh and there is no crash report

Before you leave the computer for a time, try this;
'''[https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode Start Firefox in Safe Mode]''' {web link}
While you are in safe mode;
Press the '''<Alt>''' or '''<F10>''' key to bring up the tool bar.
Followed by;
Windows; '''Tools > Options'''
Linux; '''Edit > Preferences'''
Mac; ''application name'' '''> Preferences'''
Then '''Advanced > General.'''
Look for and turn off '''Use Hardware Acceleration'''.
Then let it go for a while. After restart.

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