- If you simply want your browser to remember which certificates it has already accepted, and inform you if any certificate makes a sudden change, you can install Certificate Patrol [archive].
- I removed this, because Certificate Patrol has not been recommended by The Tor Project. Since it fades in popups, it may alter the browser fingerprint. Therefore not a general recommendation. --Adrelanos (talk) 18:47, 18 November 2013 (CET)