Review for Extra Folder Columns by Edward Gelb
Rated 3 out of 5 stars
Good to have this addon to bring back a feature that was taken away in TB3. But, the numbers do not line up correctly in the column closest to the drop down menu. They hug the line. They should be under the column heading, but they are under the drop down menu.
This review is for a previous version of the add-on (0.3).To create your own collections, you must have a Mozilla Add-ons account.