It is possible that your firewall or other security software blocks or restricts Firefox without informing you, possibly after detecting changes (update) to the Firefox application. 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 for Firefox and the plugin-container process and the updater process.

See:

• https://support.mozilla.org/en-US/kb/server-not-found-connection-problem
• https://support.mozilla.org/en-US/kb/Firewalls
• https://support.mozilla.org/en-US/kb/fix-problems-connecting-websites-after-updating

I reinstalled FF 73 and somehow got my bookmarks back through sync so maybe it will work right now. Having to go back and choose preferences which shouldn't have been destroyed by update. Thanks for the reply.

If you reinstalled through a nondestructive method (you didn't remove your Firefox data folders), you might also take a look at the about:profiles page to see whether your previous data remains available in a different profile.

"you might also take a look at the about:profiles page" COMPLETELY UNABLE ACCESS ANY MOZILLA PAGE because Windows 73 will not load web pages. I am reading your site via Chrome. HELP HELP HELP. I reinstalled and now have N.O.T.H.I.N.G.

ablstnlki12 said

"FF 73 has ruined my day so far."

ADD ME TO THE LIST! Haysoos, what a disaster. I have desktop folder "Old Firefox Data," but useless since I can't access a single solitary webpage via Firefox.

Do y'all ever test this stuff before you send it out? Just a suggestion.

See also:

• https://old.reddit.com/r/firefox/comments/f2d5cu/nothing_will_load/