It's been years since I posted on the WCG forum :)
I'm not sure that this is the most appropriate section for such reports, but I'm sure moderators will move the topic where it belongs, if necessary.

So... I'm writing because I recently installed the SSLeuth Firefox extension ( https://addons.mozilla.org/en-US/firefox/addon/ssleuth/ ). I have been using it to get some insight into encryption strength on the web sites that I attend... and, well, at 4.9/10, the WCG site receives one of the lowest marks that I've seen so far ;)

This mark is mainly due to:
* lack of TLS 1.1 and 1.2 support. This is confirmed by raising the security.tls.version.min parameter in Firefox's about:config: if set to 2 or higher, the browser refuses to connect to the WCG site, due to lack of common protocols between server and client;
* lack of PFS cipher support (though TLS 1.0 supports several such ciphers): if I disable both RC4 and non-RC4, non-PFS ciphers globally through SSLeuth's popup, I can't reach the WCG site either, again due to lack of common protocols between server and client.

It's true that many other sites on the Internet don't support 21st century ciphers yet (TLS 1.0, the best WCG supports, was published in 1999); however, many users now use browsers with TLS 1.1 and 1.2 support, and could enjoy better ciphers if the server configuration were improved :)