Rated 5 out of 5 stars

Sure, FF 3.6 will natively hide the menu bar -- finally -- but that only works if your menu bar is the only item in the row. I personally use this addon to hide other things, such as rarely-used buttons belonging to other addons, in the row at the end of the menu, and this addon is still necessary for that purpose. Without it, placing any buttons next to the menu will cause the menu bar to be always visible, although the menu items themselves will be disabled if the option is unchecked. Thanks for a great, useful (if simple) addon and keeping it functional!

This review is for a previous version of the add-on (3.6.20100218).