On my computer, the lichess.org site does not open with the browsers Chrome, Opera, Brave.

On my computer, the lichess.org site does not open with the browsers Chrome, Opera, Brave. The reason is indicated as "insecure connection". Changing security settings of browsers, including disabling security, doesn't help. Everything works in the Mozilla browser. What's the matter here?

https://lichess.org/forum/lichess-feedback/ssl-connection-issues
Read this

When you receive that "insecure connection" page , just click - advanced > proceed to lichess.org (unsafe)