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Firebug - http://www.getfirebug.com/
Tools for web development, allow inspect, edit and monitor CSS, HTML and JavaScript live in any web page. Include documentation, FAQs, videos and discussion groups. |
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HTML Validator - http://users.skynet.be/mgueury/mozilla/
An HTML and SGML validator, based on the HTML Tidy and OpenSP algorithms originally developed by W3C. Checks pages on the fly. |
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Colour Contrast Analyser - http://juicystudio.com/article/colour-contrast-analyser-firefox-extension.php
Reveals the colour contrast of all elements in the DOM. |
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ColorZilla - http://www.iosart.com/firefox/colorzilla/
A collection of tools, including a Color Picker similar to the one found in Photoshop, an Eyedropper that helps to get a color reading from anywhere in the browser window and a Page Zoomer that helps set the page zoom to anything between 20 and 1000 percent. |
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Aardvark - http://karmatics.com/aardvark/
By clicking an element you will able to remove, view source, isolate and see element information. |
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Dust-Me Selectors - http://www.sitepoint.com/dustmeselectors/
Finds and display unused CSS selectors. |
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LinkChecker - http://www.kevinfreitas.net/extensions/linkchecker/
Check the validity of links in a html document. |
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View Source Chart - http://jennifermadden.com/scripts/ViewRenderedSource.html
Draws a color, coded chart of a webpage's source code. |
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Modify Headers - http://modifyheaders.mozdev.org/
Allows the user to add, modify and filter out HTTP request headers. |
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Console² - http://console2.mozdev.org/
Firefox extension that replaces the JavaScript Console. Display errors filtered by type (Errors, Warnings, Messages), language (JavaScript, CSS, XML) and context (Chrome, Content). Useful for web and extension developers. |