Rated 5 out of 5 stars
Updated version 1.3 is not working with Thunderbird 38.5.0. It is installed, enabled, seems to work but doesn't react on keys T, U, G.
Gosh, do I need to disable automatic updates manually? If You guys are not sure Your new version is working with older release don't put this as compatible.
Checked again and 1.2 works perfectly with 38.5.0, 1.3 - acts as not doing anything in TB.
I'm sorry, I didn't check this as thorough as I thought. It seems that ThreadKey 1.3 is indeed only compatible with Thunderbird 52.0 and higher, because of the new asynchronous loading :$