Review for AddressBookTab by DanLauber
Rated 2 out of 5 stars
If you install AddressBookTab, it will screw up the contact pane in your address book. Namely, when you highlight a contact in your address book, the contact pane will not display the contact's information -- it will remain blank -- at least in TBird 14.0.
Except for this serious defect, this add-on works just fine.
To create your own collections, you must have a Mozilla Add-ons account.