W3C Markup Validation Service

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  This will take the URL of the current tab and send it to PageSpeed Insights for a web performance analysis.

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  Web Widgetizer

  Web Widgetizer is a extension offering a range of features to enhance browsing. It allows users to create separate Opera windows for specific websites, manage favorite links, customize window dimensions, toggle auto-start, and open links in popup tabs via button click or shortcut (Ctrl + Shift + A). This versatile tool optimizes browsing convenience and efficiency.

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  Live editor for CSS and LESS - Magic CSS

  Live preview of CSS/LESS code with an in-page editor. Autocomplete, convert LESS to CSS, beautify, minify, CSS reloader, linter, ...

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  Extension source viewer

  View source code of extensions in the Chrome Web Store, Firefox or Opera addon gallery. Has button to install from Chrome Web Store.

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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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