I've used FF for years, today it will not open at all on same computer can't sign in bec when I registered Mozilla didn't send me confirmation email I used it on this am.

I added a few add-ons yesterday to FF (I'm on current version). No problem. FF opened normally today until I added a new "user" to my laptop. After that, FF does not open at all, even from my original user account, which is the administrator. I don't think it was the add-ons, but I'm not sure. I deleted the new user account, turned the computer off/on again, rebooted (numerous times) and still FF will not open for me. The FF file is still in the computer (program list), and I still have the icons and it's in the tray. I have a Dell Studio, only 1-1/2 years old, use FF exclusively as my default browser.

It is possible that your security software (firewall, anti-virus) 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
*https://support.mozilla.org/kb/fix-problems-connecting-websites-after-updating

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