Contact Tabs / VS Thunderbird 45 ? Rated 1 out of 5 stars
Contact Tabs does not function properly anymore with TB 45. It was OK with TB 38.This review is for a previous version of the add-on (2.0.12).
Edit: I submitted a new version of Contact Tabs. It should be available soon. In the mean time, you may want to download it from https://addons.mozilla.org/en-US/thunderbird/addon/contact-tabs/versions/2.0.13 and install it yourself.
Contact Tabs currently does not work with Thunderbird 45. I'm a bit short of time at the moment, but be assured that I'll try to fix it.