Workaround for highlighting current element: Rated 5 out of 5 stars

... You can turn-off *hardware-acceleration* in Firefox: options > advance > general
(I do this in my secondary -developer- profile)

This review is for a previous version of the add-on (2.0.10). 

Horizontal Scroll here! + Box Model showing ALL data at once. Rated 5 out of 5 stars

Thanks for this excellent piece of soft!
I've made a version that added: HORIZONTAL SCROLL Bar ! in main panel. Box Model panel showing ALL data at once. Caption/Titlebar Hidden (more visible space for inspected win.). - http://tiny.cc/hideplus (http://forums.mozillazine.org/viewtopic.php?f=48&t=1874965)

This review is for a previous version of the add-on (2.0.4).