To try the thousands of add-ons available here, download Mozilla Firefox, a fast, free way to surf the Web!
CloseWelcome to Firefox Add-ons.
Choose from thousands of extra features and styles to make Firefox your own.
CloseReview for CardBook by Firefox user 3dd479
Rated 5 out of 5 stars
Great extension !
But autocomplete stop working (CardBook v54.6) after an auto update of Thunderbird to the 78.5.1 version.
Back to TB 78.5.0 solved the problem, temporary I hope.
To create your own collections, you must have a Mozilla Add-ons account.