The article links to https://badssl.com/, which shows a list of links to good and bad configurations. Calomel gives more details about what is right and wrong, and sometimes surprises with its rating.
Another similar add-on I use is SSleuth. https://addons.mozilla.org/en-US/firefox/addon/ssleuth/ One features it has that Calomel apparently doesn't is that it shows you its "score" for all of the domains on a page, not just for the domain of the top-level document.
The article links to https://badssl.com/, which shows a list of links to good and bad configurations. Calomel gives more details about what is right and wrong, and sometimes surprises with its rating.