User Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/57.0.2987.133 Safari/537.36 Steps to reproduce: Starting with the update of Thunderbird to 52.0 (archlinux, 64bit) the email adress auto completion in the compose window doesn't work anymore. Entering e.g. a prefix from a mail address which is in "Collected Addresses" and also a second address book, doesn' trigger anything. I haven't seen a single completion pop up since the upgrade. Actual results: Nothing. No completion of addresses at all. All settings still say that completion is enabled. Expected results: A pop up with possible email address candidates should appear. I am using i3 wm, if that is of any interest.
Most likely caused by an add-on.