Doesn't work in 27.0.1 Rated 1 out of 5 stars

I have read all of the reviews here and it still doesn't work. I followed the advice by LEOING on two different machines on how to install from Git, but neither install worked. I am on FF 27.0.1.

Too bad, this used to be an AWESOME plugin. Now I have to use PerfectPixel in Chrome. This should REALLY be built directly into Firebug!