Rated 5 out of 5 stars

Provides very easy access to FF gui preferences and even tells you how many of them settings you can tweak based upon your browser version. For those of you who are FF-challenged, right-click on a toolbar to bring up the context menu and then click on "Customize...". You'll see an icon with the label "Advanced Settings"; you should also notice that the icon matches matches that of gui:config (addon 5523). Drag and drop it onto a toolbar and then close the Customize Toolbar window. Easier than taking a triple integral.

This review is for a previous version of the add-on (0.3.6).