Sudden error when connecting to geocaching.com

[+yxza]

Hello,

since a few weeks back I get an error when trying to connect to geocaching.com. See below.

I'm running Windows 10 with the latest patches, Firefox 119.0.

The only remedy I found so far is to open up Tools/Settings/Privacy&Security/Cookies and Sitedata/Manage Data, search for cookies from geocaching.com and delete them.

Then I can reload the connection that previously failed, but I have to login again on all pages accessing the site. A bit awkward.

Any ideas anyone?

[+MartyBartfast]

Maybe try this:

https://support.mozilla.org/en-US/kb/Certificate-contains-the-same-serial-number-as-another-certificate

[+yxza]

Already tried that. Problem is that I have no certificates that stem from geocaching.com, only cookies.