* [[CA/Changing_Trust_Settings|Changing Certificate Trust Settings in Firefox]]
** [[CA/Changing_Trust_Settings#Trusting_an_Additional_Root_Certificate|Manually import a root certificate into Firefox]]
* [https://certviewer-dot-ccadb-231121.appspot.com/certviewer Certificate Viewer] -- current tool -- can also be installed/run locally (see [https://github.com/mozilla/CCADB-Tools/tree/master/certViewer ReadMe])** [https://tls-observatory.services.mozilla.com/static/certsplainer.html Mozilla's TLS Observatory Certificate Explainer(no longer maintained)]
* [https://www.ssllabs.com/ssltest/analyze.html Qualys SSL Server Quality Checker]
* [https://observatory.mozilla.org/ Mozilla SSL Server Quality Checker]