Firefox will not open intermittently - it opens once, then will not open the next several times I try to use it - no discernable pattern or event(s) triggering failure to open

Firefox opened today at 5 pm. I closed it when finished, then tried to reopen it about 6 pm - it will not open. I have tried several times in the last hour and it will not open.
When I attempt to open Firefox, the 'busy' circle spins for several seconds, but then it stops, but Firefox NEVER opens and I get NO ERROR MESSAGE so I have no clue as to what the problem is.
I have a Dell PC, running Microsoft Windows Vista, 32 bit (I think). AS far as I know, there were no updates of any kind that preceded the Firefox problems, which started about one week to 10 days ago.
I have re-downloaded the program; I have uninstalled and then redownloaded the program to no avail. I can not figure out any kind of pattern, although it does seem to be more likely to open in the a.m. hours - but not always.
I really prefer Firefox as my default browser, but I will not continue to use it on such an intermittant basis. Please help me trouble shoot this issue. By the way, I have had no problems, when Firefox won't open, opeing IE or Chrome, so I know it is not a generalized internet access issue.
Please help.
29Aug2011, Kay Arnold

Which security software (firewall, anti-virus) do you have?
Try to boot the computer in Windows Safe mode with network support (press F8 on the boot screen) as a test to see if that helps.
A possible cause is security software (firewall,anti-virus) that blocks or restricts Firefox or the plugin-container process without informing you, possibly after detecting changes (update) to the Firefox program.
Remove all rules for Firefox and the plugin-container from the permissions list in the firewall and let your firewall ask again for permission to get full unrestricted access to internet for Firefox and the plugin-container process and the updater process.
See:
*https://support.mozilla.org/kb/Server+not+found
*https://support.mozilla.org/kb/Firewalls

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