W3C Markup Validation Service

AddCSS

This extension allows you to add your own custom website specific CSS style sheets.

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Web Developer

Adds a toolbar button with various web developer tools. The official port of the Web Developer extension for Firefox.

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Custom Style Script

Add Custom JavaScript (JS) Code or Styles (CSS) to any Page.

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Помощник диагностики

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Polypane helper

Open the current page or links in Polypane, the developer tool for responsive web development and design.

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