the cert patrol add-on for firefox can be configured to behave that way: http://patrol.psyced.org/ http://patrol.psyced.org/ normally it just shows you a hori

the cert patrol add-on for firefox can be configured to behave that way: http://patrol.psyced.org/ http://patrol.psyced.org/ normally it just shows you a horizontal bar alerting you when a host's ssl certificate changes, and whether it thinks it was for a good reason like the old cert being near its expiration date. annoyingly, google has a number of different ssl certificates installed on different servers/load balancers (some wildcard, some not, some signed by different CAs, some signed by google's root) so nearly every time i would use a google service, the add-on would be throwing warnings at me that must be manually clicked to be dismissed. eventually i gave up and stopped using the add-on.