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Firefox Extensions for Web Developers
A list of extensions built primarily for web designers and programmers.
loadaveragezero.com
cuneAform has been designed to create a HTML Editor that anyone can use.
cuneaform.mozdev.org
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.
www.iosart.com
Extensions for HTML, CSS and RSS validation.
www.nu22.com
Check the validity of links in a html document.
www.kevinfreitas.net
Toolbar extension for helping penetration-testers test the security of websites, networks and webpages.
tuvbar.mozdev.org
Adds a JS Console context-menu item which presents a "Toolbars" submenu for hiding or showing the eval / mode toolbars.
addons.mozilla.org
A toolbar with useful functions for website authors. Includes download, full feature list, screenshots, and discussion forums.
chrispederick.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.
www.getfirebug.com