Hello,

The Reset Firefox feature can fix many issues by restoring Firefox to its factory default state while saving your essential information. Note: This will cause you to lose any Extensions, Open websites, and some Preferences.

To Reset Firefox do the following:

1. Go to Firefox > Help > Troubleshooting Information.
2. Click the "Reset Firefox" button.
3. Firefox will close and reset. After Firefox is done, it will show a window with the information that is imported. Click Finish.
4. Firefox will open with all factory defaults applied.

Further information can be found in the Refresh Firefox - reset add-ons and settings article.

Did this fix your problems? Please report back to us!

Thank you.

A possible cause is security software (firewall,anti-virus) 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 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

You can try to reset (power off/on) the router.

• http://kb.mozillazine.org/Error_loading_websites
• https://support.mozilla.org/kb/troubleshoot-firefox-issues-caused-malware

I am having exactly the same issue.

Installing, resetting, with or without addons. Older Versions, newer ones.

It does not work

P.s. - "This may take a few minutes" (hours it is) / Server not found.

This is the reported problem

I'm looking for a solution for the "Server Not Found message I keep getting repeatedly, and this thread does not provide a solution.

However, I had to sign in to say that the "Reset Firefox" feature should never be presented as a first solution to any problem. It's a last resort, not first resort. Doing so is lazy thinking and reckless, especially when dealing with users who may be newbies or inexperienced, or who may not read instructions so carefully and understand the ramifications of wiping their settings and customizations.

There are plenty of articles and Knowledge Base entries that touch upon this user's problem, so why wasn't he directed to those, or at least the invariable "Open in safe Mode", before suggesting such a drastic "solution"?