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Pixel Perfect 2.0.14
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.
Selecting the "Lock" option will allow you to inspect elements on the page that are below the active overlay. This is handy if you want to adjust the page in real time to match the active overlay.
The overlay opacity can also be adjusted for specific use cases.