Firefox 10.0.1 will not open; I just upgraded from Firefox 9.0 to 10.0.1, the download completed, I clicked the Restart button; but absolutely nothing happens, no error message, nothing; I cannot start Firefox at all.

I have Windows XP SP3. Internet Explorer does work, which is how I'm able to tell you this. I have few plugins, and nothing unusual; in fact, before the popup window invited me to upgrade to Firefox 10.0.1, it first did a check for incompatible plugins and apparently found none.
Maybe I should do a System Restore and not try Firefox 10 again until the bugs are fixed.

You may need to delete the Firefox program folder before (re)installing the latest Firefox.<br />
In case you still have problems after installing then check your security software.
A possible cause is security software (firewall) 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 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
*http://kb.mozillazine.org/Browser_will_not_start_up

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