Firefox won't open after update/upgrade--how do I correct this?WinXP SP3

I got a message saying I should update/upgrade. I did AFTER SETTING RESTORE POINT. After this Firefox will not open (I have tried several ways). I went to restore point and restored. Still will not open. If I can't get it working I will look for another browser. I am now using IE and it is too slow. Thanks for help.

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.com/kb/Server+not+found
*https://support.mozilla.com/kb/Firewalls

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