Hi Eli Dumitru , This could be caused by a malware infection on your computer or it could be caused by an add-on that you have installed.

You can try these free programs to scan for malware, which will work with your existing antivirus software:

Microsoft Safety Scanner https://docs.microsoft.com/en-us/windows/security/ threat-protection/intelligence/safety-scanner-download

MalwareBytes Anti-Malware https://www.malwarebytes.com/premium/

Anti-Rootkit Utility - TDSSKiller https://www.bleepingcomputer.com/download/tdsskiller/

MalwareBytes AdwCleaner https://www.malwarebytes.com/adwcleaner/

ESET Online Scanner https://www.eset.com/us/home/online-scanner/

Running more than one or all of the above mentioned Scan Tools is recommended since they scan at different levels of your computer. And, of course, run the scans with Firefox Closed.

Further information can be found in the Troubleshoot Firefox issues caused by malware article: https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-caused-malware ___________________________________________________________________

If that doesn't fix the issue, try running Firefox in it's Safe Mode: https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode to see if the issue goes away. If it does, it's likely caused by an add-on, so you will need to use trial and error to determine the culprit.

Hope this helps.

RobertJ,

Thank your for your comprehensive reply. When I went to work on this, I could no longer find the update that wasn’t installing. I looked though my History, but it wasn’t there. So I clicked on Update in Firefox Options, and it said my Firefox is up to date. I don’t see how this can be true, but I don’t know what else I can do to find that one that wasn’t working.

Eli

I notice a Flash Player mention in the screenshot. A legal Firefox update would never look like this.

If you get a pop-up message asking to update Firefox or plugins or scanning for malware then such a message is likely a scam and you should NEVER respond to such an alert to avoid getting infected with malware.

• only update Firefox via "Help -> About" or by downloading and installing Firefox from the Mozilla and never via a pop-up or link on a web page.
• plugins should only be updated via the plugin itself or by visiting the home page of the plugin.

See also:

• https://support.mozilla.org/en-US/kb/i-found-fake-firefox-update

Thank You !!