Not compatible with Firefox QuantumNot compatible with Firefox Quantum Pixel Perfect is a Firefox extension that allows web developers and designers to easily overlay a web composition with semi-transparent layers (images). These layers can be consequently used for per pixel comparison between the page and a layer. Only with Firefox—Get Firefox Now
![Pixel Perfect – Get this Extension for 🦊 Firefox (en-US)](https://cdn-ak-scissors.b.st-hatena.com/image/square/7bdb418ba092af446e1bca3d385b407122ecbbca/height=288;version=1;width=512/https%3A%2F%2Faddons.cdn.mozilla.net%2Fuser-media%2Fpreviews%2Ffull%2F154%2F154432.png%3Fmodified%3D1530208408)