Rated 4 out of 5 stars

I used this a lot in FF2, along with a userChrome line that removed the Bookmarks menu item.

For FF3, you can generate a plugin with this and other icons at http://codefisher.org/toolbar_button/toolbar_button_maker ... doesn't support right-click yet though.

This review is for a previous version of the add-on (0.0.5).