Browse - Computer Tips - My "Confirm Security Exception" button (for certificates) doesn't work.

Date: 2015jun30
Updated: 2019jan11
Product: Thunderbird

Q.  My "Confirm Security Exception" button (for certificates) doesn't work.
How can I fix this?

A.  For me, removing the cert8.db and cert_override.txt files in the profile folder did the trick.  

Location of your profile:
http://davekb.com/browse_computer_tips:thunderbird_where_is_my_data:txt

I read that solution here
http://forums.mozillazine.org/viewtopic.php?f=38&t=1160375

I'm pretty sure its caused by my virus-checker intercepting the TLS (SSL) connection to
the IMAP servers I connect to.  If I disabled that function in the virus-checker it would no longer
perform this man-in-the-middle function.  For mail on my LAN I could also switch to not using TLS
- then there would be no certificates.