Firefox Community Forum

Current Setup: OS: Windows 11 Home (10.0.26200) Firefox Version: 151.0.2 (Build ID: 20260525130955)

Issue:

• Firefox suddenly is unable to connect to any wesbite
• All attempts to browse result in the "Secure Connection Failed" screen
• All other browsers function fine with no network connectivity issues

Exact Display Text:

Secure Connection Failed

The page you are trying to view cannot be shown because the authenticity of the received data could not be verified. What can you do about it?

The issue is most likely with the website, and there is nothing you can do to resolve it. You can notify the website’s administrator about the problem.

Attempted Fixes / Things Confirmed:

• Everything mentioned in: Firefox can't load websites but other browsers can

• Relevant about:config values:

* * security.enterprise_roots.enabled -> True

• * security.ssl.enable_ocsp_must_staple -> True
• * security.ssl.enable_ocsp_stapling -> True
• * security.tls.version.max -> 4
• * security.tls.version.min -> 3

• System locale and timezone are correct
• DNS over HTTPS is set to OFF
• HTTPS-Only Mode is set to Don't enable HTTPS-Only Mode
• Restarting in Troubleshooting Mode
• Disabling the Anti-Virus (including the device Firewall)
• Disabling any VPNs or network proxies
• Clearing cache and browsing history
• Clearing certificates from the Certificate Manager in Settings
• Attempting connection with a newly created profile
• Clearing the cert9.db file for Firefox to reset certificate information
• Refreshing Firefox (resetting it completely)
• Uninstalling and reinstalling Firefox (after clearing all Mozilla related %appdata% folders)

Observations

• When trying to mess with the device timezone and see if changing it back to the correct one would "reset" something, after a few attempts of starting Firefox in the wrong timezone and then restarting it after changing to the correct one, for a single session, I was able to browse normally again. I closed Firefox to see if the problem was fixed but it went back to the "Secure Connection Failed" page. Was unable to reproduce the same behavior.

• Tried installing a portable version of Firefox (151.0.3) from Firefox Portable .

After installation, the first session works perfectly fine but after I close the session and restart Firefox, it gives the same "Secure Connection Failed" message.

• * Reinstalling the portable version in the folder, gives the error from the get-go, not even the initial post-installation session works but installing in a different folder works fine for the first session but all subsequent restarts (sessions) of the browser give the same error.

My mouse is setup so that the tilt wheel does Ctrl+Tab and Ctrl+Shift+Tab rather then whatever actions the tilt wheel would normally send, and that has worked fine for years, but now all of a sudden it is not working in Firefox, it's changing the zoom level instead which is not what I want. Firefox must be reading the mouse directly or something, because it shouldn't even be getting normal tilt wheel events.

Hi Everyone,

I've been having this problem for a wee while when I'm browsing facebook (which works better in Chrome) the site on firefox and as well as messenger is really laggy and I'm wondering if there is a hidden setting that I should change to improve this?

I only have adblock addon installed and I cleaned out the history and browser cookies ect but the problem still remains.

Any ideas? Thanks Rob

Hello, I can't log in to Facebook, only through Firefox, and that's the problem. Edge and Chrome work fine. I've already deleted cookies and temporary files, and still nothing. This problem has been occurring for a while.

Mozilla has been bragging about the free built-in Firefox VPN for months now. I still don't see it. I'm on the latest release (151.0.3) but I don't see any way to access it. I know they've said it would be a phased rollout but it's been a long time coming already. Am I doing somethin wrong?

I can not seem to find the button to open a saved, closed tab group. I have googled, and there seems to be a lot of people with the same issue. However, None of the information given under those forums provides me with a clear, easy solution. Please help.

https://areena.yle.fi/tv https://areena.yle.fi/1-71170823

Pages not starting to show. Page itself working ok. in Crome works 100% Note: Funny thing is that many of the videos work ok, but some not ??

Malwarebytes is picking up and blocking an outbound connection request from Firefox - www.highperformance.com. Anyone else experiencing this?

I have ran into a peculiar problem where special characters from non US keyboard do not work in search. In my case it is ％ for TABS specifically (instead of english %). I wanted to correct the problem by changing 'Keyword' field in 'Search Engine' but it is read-only for browser functions. Is there a workaround or a solution I'm missing? Thanks for your help

How is this possible earlier it performed normaly. But sinds this week I can't watch TV on my laptop under firefox it keeps telling me SORRY THERE SEEMS SOMETHING WRONG And when I try it under EDGE it performs normaly. I want it back under FIREFOX please