It wasn't hanging up. It wouldn't start at all, saying that DEP was preventing it from opening.
Restarting my computer had no effect.
I've had Firefox leave stuff behind that would cause FF to not start. Cleaning up the process would clear that and FF would then behave normally.
I just checked one of my XP machines and DEP is set to alwaysoff in my boot.ini file. the line looks like
/noexecute= AlwaysOff

I hate it when I do that.




