Firefox and Utilities Won't Open

Suddenly, Firefox stopped opening. When I try opening Utilities like Activity Monitor to see what's up and Disk Utility to repair permissions, they refused to open too. Other programs - Word, Safari, etc., open no problem. I also noticed that my GPU, which had been running @ 77 centigrade, was up to 85. Other temps:
CPU Core 1: 67
CPU core 2: 67
IStat shows User CPU at 100%, with Safari, my only open app, at 100.5. When I had Word open, it was at the same time also showing 97%. My computer thinks it's a high school football coach: "You gotta give two hundred percent!"
I ran rebuild on Disk Warrior from the CD, which found one error, but it made no difference.
Things I've changed recently are:
4 days ago, old 22" Cinema Display went dead. I was running two, and the other was on its way out, so I replaced with a pair of 23" Samsungs. No problems with that initially, but when I see higher temps with the GPU, I wonder if there's a connection.
This afternoon, I tried installing SafariStand, which first required installing SIMBL. When I started having problems, I backtracked and deleted SIMBL from the input managers, but it hasn't helped.
Final difference is that Firefox installed an automatic update. With the Firefox problem, I tried trashing the plist - no help - then the app itself and downloaded a fresh copy - also no help.
I've got my system and apps on one hard drive and my data on the other.
Thanks for any thoughts.

Try each step in order, checking as to whether the issue is fixed before moving on.
1. Safe boot (hold shift at the chime until the spinning gear) and run your preferred housekeeping utility; Onyx, Cocktail or whatever.
2. Delete plist files for affected apps.
3. Reset PRAM. Hold Cmd-Alt-P-R at the chime until it chimes again. Keep holding it down for a total of 4 chimes.
4. Reset NVRAM. Hold down Cmd-Alt-O-F at the chime until you get an open firmware prompt. Type:
reset-nvram
set-defaults
reset-all
It will reboot.

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Firefox and Utilities Won't Open

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