I can't connect to any version of Firefox, although I could up until 2 days ago. windows xp, desktop

I was using the regular version of Firefox and it was working until two days ago. I uninstalled and reinstalled, tried the beta version, not working either, my internet provider tech guy can't figure it out either but he is not familiar with Firefox. HELP! i had internet explorer

A possible cause is security software (firewall) that blocks or restricts Firefox without informing you about that, 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.
See [[Server not found]] and [[Firewalls]] and http://kb.mozillazine.org/Firewalls

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