Font Inspector in Firefox Nightly

I built a font inspector for Firefox. It's now in @FirefoxNightly. It shows you the font used by the selected element in the page, or all the fonts used in the page.

The information exposed are:

Limitation: I'm focusing on font faces for now. There's probably more things we can show (colors, font size, line height,…), but it's not easy to show the font-face info and CSS info simultaneously: we can have the same font face and several font sizes in the same selected node (a node can include several nodes, with different styles and different font-faces).

If you have any idea how to improve this tool, let me know on Twitter (@paulrouget).