Devil Debugger by Vignesh Miller

Toggle visual borders to debug HTML structure. Built for frontend developers who demand pixel-perfect precision.

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You'll need Firefox to use this extension

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About this extension

Devil Debugger is a lightweight developer tool that lets you instantly toggle outlines around core HTML elements like <div>, <section>, <img>, and more. It helps frontend developers quickly inspect page structure without modifying the DOM.

Toggle borders with a single click

Works on any site (via permissions)

Built for clean debugging with no injected inline styles

Perfect for anyone building or troubleshooting CSS layouts.

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