Hi,

The latest Firefox version is 143.0.1, which means your Firefox is not up to date. Have you tried clicking Download in the first popup? If so, what has happened?

Denys -

Many thanks for your response. Appreciated.

Clicking on "DOWNLOAD" on the results in nothing -- other than the pop-up reappearing the next time again.

Nels

Back again:

Firefox HELP tab = the attachment

Actually, clicking on "DOWNLOAD" results in this:

Aha! That actually explains what's happening. Your Firefox can't connect to mozilla.org, the website it gets updates from. Could you please copy the link from your last screenshot and try to open it in a different browser (e.g. preinstalled Edge). Is it accessible that way? You can also try just https://www.mozilla.org/

OK. But I do not get it!

I've used Firefox for years, and both manual and automatic update functions have worked with no problem.

But now, for no apparent reason, there's a problem and it can't connect with Mozilla?

Even Opera browser rejects https://download.mozilla.org/?product=firefox-stub&os=win&lang=en-US

I don't know what you mean about "Edge".

Went to download "Firefox" from mozilla.org and here's what I got:

Rather running around in circles, am I not?

But, thanks.

If Opera also can't open the link (which is valid), then it should be your network problem rather than Firefox, meaning something on your computer / your provider / your organization blocks mozilla.org. Check out Configure firewalls so that Firefox can access the Internet.

Moving along - thanks for your help with this.

You say: Check out Configure firewalls so that Firefox can access the Internet and provide link:

https://support.mozilla.org/en-US/kb/configure-firewalls-so-firefox-can-access-internet

Takes me to here:

====================================

Checking for Windows 10 Firewall To see if you're running Windows Firewall:

   Right-click the Windows icon. A menu will appear.
   Select Control Panel from the menu. The Control Panel will appear.
   In the Control Panel, select System and Security.
   In System and Security, select Windows Firewall. 

Configuring Windows 10 Firewall If you're running Windows Firewall and having connection problems in Firefox:

   On the left side of the Windows Firewall panel, click Allow an app or feature through Windows Firewall. The Allowed apps panel will appear.
   Click the Change Settings button.
   Find Mozilla Firefox in the list of programs. If it is there, click to select it. If not, skip the next step.
   With Mozilla Firefox (or firefox.exe) selected, click the Remove button. Confirm that you want to remove the entry.
   Click the Allow another app button. The Add a Program window will appear.
   In the Add an app window, click the Browse button.
   Navigate to the Firefox program directory (e.g. C:\Program Files\Mozilla Firefox\) and double-click on firefox.exe.
   Click the Add button.
   Click the OK button to close the Allowed apps panel. 

[NOTE: To the right of the Firefox.exe listing are two columns, "Private" and "Public"; "Private" is unchecked while "Public" is checked . . . for whatever this tidbit of information is worth . . . ]

====================================

Then I go to

https://download.mozilla.org/?product=firefox-stub&os=win&lang=en-US

Result? Same old . . .

Secure Connection Failed An error occurred during a connection to download.mozilla.org. PR_END_OF_FILE_ERROR Error code: PR_END_OF_FILE_ERROR

   The page you are trying to view cannot be shown because the authenticity of the received data could not be verified.
   Please contact the website owners to inform them of this problem.

Learn more… Try Again

So I appear to be at the same place as when I began this treasure-hunt -- unable to update Firefox.

Thanks nonetheless for taking time to try to help me bush-whack my way through to a successful solution. Much appreciated.

Nels

Hi

This support article should help:

https://support.mozilla.org/en-US/kb/secure-connection-failed-firefox-did-not-connect

Paul - Thank you for "joining the muddle . . . ". From the article you suggested:

POSSIBLE SOLUTIONS 1. Updating your antivirus security software or modifying its settings can resolve issues caused by software products that scan encrypted connections. On Windows, you can uninstall your third-party software and use the built-in Windows Security with Microsoft Defender Antivirus.

   -  The only security software I can determine is the default Windows Security; no third-party software that I'm aware of; haven't been able to figure out how to find out if there is such hiding somewhere in the system.

2. An incorrect system clock can cause Firefox to detect that the website's security certificate is expired or invalid. Make sure your computer is set to the correct date, time and time zone. See Troubleshoot time-related errors on secure websites.

   -  Clock and calendar are fine

3. Check if the website is down. If a website doesn't load in Firefox, it might be a problem on the site's end.

   -  The website is mozilla.org; highly unlikely that it would be "down" for several days, methinks . . . ?

4. Try opening the same site in another browser. If it doesn’t load there either, the website is likely experiencing issues.

   -  As noted previously, I did attempt downloading via Opera but the same SECURE CONNECTION FAIL showed up there.

5. Clear cached certificates in Firefox. If Firefox has saved an outdated or untrusted certificate, removing it may fix the error. Click the menu button Fx89menuButton and select Settings. Go to the Privacy & Security panel, go down to the Certificates section, click View Certificates…, select any untrusted or outdated site certificates, and click Delete or distrust…

   -  Opened SETTINGS, opened PRIVACY & SECURITY; opened VIEW CERTIFICATES; haven't the slightest clue about which may or may not be an "outdated or untrusted certificate"; my predilection is to simply delete them all and let the system reestablish new ones as I go along from this point; any problem(s) that may cause?

Thank you / Nels Related articles