With FFx 17ESR, Cookie Monster Version 1.1.0 is OK, 1.2.0 does not work Rated 4 out of 5 stars
Using Firefox 17.0.11 ESR
Cookie monster version 1.1.0 works okay
Cookie monster version 1.2.0 does not work:
the toolbar button does not display a menu when clicked.
(could be a conflict with Vertical Toolbar extension since my Cookie monster button is installed in my Vertical Toolbar)