Comment 11 for bug 1904789

I understand that it's particularly difficult to reproduce the bug because it requires a mail server with a certificate problem. Since it was blocking me, I temporarily dealt with this by not using the Snap version of TB and returning to the versions from the official Ubuntu PPA (in my case TB 68.10.0 on my Ubuntu 20.04.1 LTS machine and TB 78.3.2 on my Ubuntu 20.10 machine) which are not affected by this issue. That's why I tagged it as Snap-specific.

Today, I've finally found a solution to the certificate problem on my email server (which of course was the goal all along) so I returned to the Snap version on my Ubuntu LTS machine (to be able to use the most recent version of TB). Now, the "Add Security Exception" window is not blocking my anymore.

Sorry I can't bring more help to solve this problem but I hope this will help others to deal with it.

So, I don't think we should close this ticket because bypassing the security warning is still a useful temporary solution for end users which shouldn't be blamed for servers problems that can sometimes occur but as far as I'm concerned I can now move on.