Firefox does NOT have a firewall. When did this issue first appear; after what happened? Microsoft '''INSISTS''' that you use IE to get windows updates, not a FF issue. You could have an infection on your PC. Your firewall settings could be blocking the sites. Check your security software settings, you may be blocking at that level, firewall and FF add-ons. https://support.mozilla.com/media/uploads/images/2011-03-13-10-18-14-e458fa.PNG FF settings: Tools, Options, Privacy Tab, Exception Button, add "www.yourweb address" and click Allow Button, ALSO check for any BLOCK settings. Click close button, ok button and Test the results. https://support.mozilla.com/media/uploads/images/2011-03-13-10-18-05-ed2938.PNG

Thanks will try these suggestions. My error, I should have ID'd the firewall as Webroot (not Firefox).