Web developers are using a host of Firefox extensions to improve their efficiency. I use the “Web Developer” extension, which has just about everything within one addon.

Here’s a short-list and brief description of popular Firefox extensions:

HTML Validator

This is a Mozilla extension that adds HTML validation inside Firefox and Mozilla. The number of HTML errors on a page are presented in an icon in the status bar when browsing. The details of the errors are seen when viewing the HTML source for the page.


This is a free cross-platform FTP client for Mozilla Firefox, which provides easy and intuitive access to FTP servers.

Professor X

Professor X allows you to see inside a page’s header without viewing the sourcecode; it will display the contents of the page’s head element, including Meta, Script and Style content. You can see how a website was constructed without having to go back and forth between the sourcecode and the page in your browser.

IE Tab

This extension embeds Internet Explorer (IE) in a Mozilla/Firefox tab, which allows you to view your work in IE without launching a separate window.


FireBug allows you to explore the far corners of the DOM by keyboard or mouse. You can use the tools to monitor your JavaScript, CSS, HTML and Ajax all in one. The extension includes a debugger, an error console, command line, and a variety of fun inspectors.


Want the look and feel of Dreamweaver in a Firefox extension? This addon allows you to edit your documents right next to your web pages as you surf.

Server Switcher

Server Switcher is a navigational help tool, which allows you to easily switch between sites on your development and live servers.

SEO for Firefox

This tool was designed to add more data to Google and Yahoo! to make it easier to evaluate the value and competitive nature of a market. SEO for Firefox pulls in many useful marketing data points to make it easy get a more holistic view of the competitive landscape of a market right from the search results. In addition to pulling in useful marketing data this tool also provides links to the data sources so you can dig deeper into the data.

Here are a few more that are self-explanatory:

AdSense Preview

Screen Grab

Server Spy

Additional Resources: For a discussion of this list, see this post recently published on digg.com.

[tags] Firefox addons, Firefox extensions, Web Developer Tools, eoecho.com, eoecho [/tags]