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Pixel Perfect 2.0.13 No Restart
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.
About this Add-on
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.
The Development Channel lets you test an experimental new version of this add-on before it's released to the general public. Once you install the development version, you will continue to get updates from this channel. To stop receiving development updates, reinstall the default version from the link above.
Caution: Development versions of this add-on have not been reviewed by Mozilla.
- Version 2.0.4-beta.1: