Rated 4 out of 5 stars

v1.3.6; FF 12.0 on OS X [10.6.8]
Doesn't display correctly, only half of the bookmarks show. Close window & open a new one and it works correctly.

Used Anders Labich's solution below and installed v1.3.3 & set automatic updates to off. Works perfectly every time FF is launched!

-1 star but still a great add-on.

This review is for a previous version of the add-on (1.3.6.1-signed).