What does the `ssl_error_no_cypher_overlap` error in Firefox indicate?

The `ssl_error_no_cypher_overlap` error in Firefox means that your browser and the website's server cannot agree on a common encryption method (cipher suite) to establish a secure connection. This usually happens when either your browser is too old to support the server's modern security protocols, or the server is using outdated and deprecated security protocols that your modern browser no longer trusts or supports.