Works Great! Rated 5 out of 5 stars

I looked through Web Developer and wasn't able to fine the functionality offered by this toolbar toggle, so not sure what the first two reviewers are referring to. Yes, you can go to the View>Toolbars>Web Developer and make it disappear but having this little icon in the toolbar to click is a lot faster and simpler. I use this everyday.

This review is for a previous version of the add-on (0.2).