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Aardvark
Serves as a Firefox-integrated tool for web developers, designers, and casual readers. Removes unwanted banners, views source codes of elements, and explores the block by block creation of pages.
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Chrispederick.com Web Developer Extension
Downloadable toolbar offering a variety of web development tools and options. Also works with Flock and Seamonkey.
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ColorZilla
Advanced eyedropper, color picker, and palette viewer usable as a Firefox extension.
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Firebug
Web development extension for Firefox. Edits, debugs, and monitors CSS, HTML, and JavaScript in any web page.
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FirePHP
AJAX development add-on for Firefox enabling access to the Firebug Console using a simple PHP method call.
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HTML Validator
Extension based on the Tidy and OpenSP algorithms. Adds HTML validaton within the Firefox and Mozilla browsers.
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Juicy Studio
Color contrast analyzer. Presents color combinations used in pages and summarizes the foreground color, background color, luminosity contrast ratio, and color difference.
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LinkChecker
Color coded webpage link checker. Classifies broken, forwarded, good, and skipped links.