Comment 22 for bug 1904789

Apologies if this isn't the right place to post. I'm new to Ubuntu, and couldn't find anything recent that addresses my problem via a search of help topics.

As of this morning I can't access Thunderbird due to a box asking me to add a security exception as my mail server is attempting to identify itself with invalid information. The box to add an exception comes pre-ticked, but when I click on the 'Confirm Security Exception' button the box just remains. There are solutions available elsewhere, but they're all dependent on my being able to get into Thunderbird and change settings, and the presence of the box won't let me access the settings.

Is there a way around this. Please bear in mind I'm new to Ubuntu and have little experience in coding.