Rated 3 out of 5 stars

per user1962 el oct. 12, 2011 ·

Very good Tool!
But there are problems in combination with Lightning (Win7 Home Premium / Thunderbird 7.0.1 / Lightning 1.0b7). Lightning and Extra Folder Colums result deactivated menues and context menues for lightning (grey without funktion).

Addendum: The Problem appears only in combination with Adblock Plus 1.3.10. When I deactivate Adblock, everything is alright.
Standard8: You are right!

This review is for a previous version of the add-on (1.1.3). 

per Firefox user beeb85 (desenvolupador) a oct. 14, 2011 ·

I've been using that combination just fine. You may want to check there isn't a conflict with a different extension.