Review for Extra Folder Columns by Gary Berns
Rated 1 out of 5 stars
Although TBird says it is installed, nothing has been added to folder panel. Also, options greyed out under add ons and so can not see if that is the problem.
This review is for a previous version of the add-on (1.1.3).To create your own collections, you must have a Mozilla Add-ons account.