Pixel Perfect Firebug Extension Pixel Perfect is a Firefox/Firebug extension that allows web developers and designers to easily overlay a web composition over top of the developed HTML. Pixel Perfect extension has been originally introduced for Firebug. This new version is built on top of native Firefox developer tools with improved user experience and features. Among other things, remote devices such as mobile phones also supported. Enjoy! New PixelPerfect GitHub Home - https://github.com/firebug/pixel-perfect Official Mozilla Addons Page - https://addons.mozilla.org/en-US/firefox/addon/7943