I like it(InspectThis 1.0.0). Rated 5 out of 5 stars

I like it(InspectThis 1.0.0).

But I had to skin the "DOM Inspector"*;
gave it a light-on-black, instead of dark-on-white.
*:
  My-Profile-for-FireFox\extensions\inspector@mozilla.org\chrome( skin/ content/ )
    skin\classic\inspector\viewers\dom\
      Dom.CSS