Review for CompactHeader by nknm
Rated 5 out of 5 stars
It DOES work perfectly in Thunderbird 12.0.1. You have to uninstall any existing version first, then install version 2.0.5.
This review is for a previous version of the add-on (2.0.5). This user has other reviews of this add-on.To create your own collections, you must have a Mozilla Add-ons account.