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I have been recently working on Pixel Perfect extension that allows web designers to overlay a page with semi transparent image and tweak the page HTML/CSS with per pixel precision - till it's matching the overlay.

This extension hasn't been working for several years (not maintained) and since requested by many users Firebug Working Group (FWG) got the opportunity to build that again and on top of native Developer tools in Firefox.

We had two goals in mind when building the extension:

  • Make the Pixel Perfect feature available again
  • Show how to build a real world extension on top of native API and tools in Firefox

This post focuses on the internal architecture. There is another post if you rather interested in the feature itself.