Hi Dennis, what settings did you change? What does the error message page say?

If you are using private windows:

In private windows, Firefox 91+ generally applies "HTTPS-First Mode" (Firefox 91 introduces HTTPS by Default in Private Browsing). Unfortunately, unlike the "HTTPS Only" feature, which you can manage in detail, "HTTPS-First" does NOT allow user exceptions.

You might need to disable "HTTPS First" and enable "HTTPS Only" in private windows to find the best balance of convenience and protection.

Disabling HTTPS First in private windows

(1) In a new tab, type or paste about:config in the address bar and press Enter/Return. Click the button accepting the risk.

More info on about:config: Configuration Editor for Firefox. The moderators would like us to remind you that changes made through this back door aren't fully supported and aren't guaranteed to continue working in the future.

(2) In the search box in the page, type or paste dom.security.https_first_pbm and pause while the list is filtered

(3) Double-click the preference to switch the value from true to false

You can close this tab now.

Enabling HTTPS Only in private windows

You can set this up on the Settings page. See: HTTPS-Only Mode in Firefox.

Thanks for the quick response. Under about:config I changed urlbar.autofill to FALSE and a couple other urlbar items.

When all this seemed to not have any effect on a particular site I was entering I finally installed version 84 of Firefox and have no problems. When I type in the site in the urlbox it shows the lock with a line through it now. Other sites such as my email and youtube use https which is fine for me.

Have gone to most of my sites now with Version 84 and all work as they should.

When you get back to a supported version of Firefox that has HTTPS First and HTTPS Only features, we can resume troubleshooting.