Bug#848299: still a problem in thunderbird-52.9.1-1

[Marcel Partap]

Yes I do know, i wasn't yet courageous enough to update to TB 60 with all my 
addons.. I recognize now that my approach doesn't help, as even stable now has 
migrated to TB60. Sorry! for that, I'll check with the new version in the next 
days and report back. 😅