Rated 4 out of 5 stars

Great add-on with a few small issues. The To field dosn't expand with Thunderbird 60 so when you get the to many email's us Bcc instead warning you can no longer edit the text. Autocomplete doesn't play with CardBook, will only search the default collected addresses.

This review is for a previous version of the add-on (1.9.0). 

Thanks for your feedback !
Version 2.0 just got approved, you can download it for TB68 ! An it can search in Cardbook !
There was also some work on the code that resize the fields (To, CC, BC...). Please keep me informed if that solved your problem.