This appears to be a known upstream bug (https://bugzilla.mozilla.org/show_bug.cgi?id=1371309), which was fixed in thunderbird 78 indeed. Let's keep this bug open until 78 is backported to bionic.
This appears to be a known upstream bug (https:/ /bugzilla. mozilla. org/show_ bug.cgi? id=1371309), which was fixed in thunderbird 78 indeed.
Let's keep this bug open until 78 is backported to bionic.