Rated 2 out of 5 stars
Doesn't seem to work at all in FF 16.x. I no longer see the icon in the toolbar. Did it move (again)? Also, your "support site" link is inaccessible: http://www.kevinfreitas.net/extensions/This review is for a previous version of the add-on (0.4.10).
Thanks for the feedback
Thanks Tim, I do appreciate the feedback and apologize for the lackluster experience you had with MeasureIt. Indeed that "support" link was down but has since been fixed up. Also, I tested MeasureIt in Fx 16 and my MeasureIt icon/button is still where I left it. Right-click any toolbar in Firefox and choose "Customize". There in the popup will be that familiar ruler icon you can then drag/drop into the toolbar of your choosing for easy access.
Thanks again for your feedback and take care!