In the account manager > <Account> > Junk filter, the label for telling Thunderbird to trust senders if they are in the addressbooks selected below doesn't break into multiple lines if it is too long for one line. A horizontal scrollbar will appear.
Created attachment 646964 [details] [diff] [review]
Comment on attachment 646964 [details] [diff] [review]
I'm not entirely sure how you ran into this, but the change makes sense to me, and fixes the bug. :) r=me!
I assume Archaeopteryx run into it in German or other version.