Best Firefox Extensions for Web Development 

The Web Developer extension adds a menu and a toolbar to the browser with various web developer tools.

Advanced Eyedropper, ColorPicker, Page Zoomer and other colorful goodies.

Draw out a ruler to get the pixel width and height of any elements on a webpage.

The number of errors of a HTML page is seen on the form of an icon in the status bar when browsing. The details of the errors are seen when looking the HTML source of the page.

A simple CSS property viewer.

As you glide the mouse over the page, you will see a red rectangle framing each element under the cursor. You will also see a little yellow caption showing the HTML element type and its class or id if they exist.

Adds a sidebar with web-development documentations.

Check the validity of links on any webpage.

The Editcss project ought to be an easy way for web developpers to edit and modify currently loaded stylesheets.

Source charting is a totally new and innovative way to look at source code.

Easy to use interface to many free and commercial Online Validation and Analysis Services. Validate and analyse HTML, XHTML, CSS, RDF, RSS, XML, WAI, Section 508, P3P, Hyperlinks, Metadata and many more.

Get the feel of Dreamweaver in a Firefox extension. Edit your documents right next to your web pages as you surf.

The SEO Links extension gives you tooltips specially enhanced for SEOs. When enabled, hovering any link in Firefox will show you Yahoo, MSN, and Google link popularity and ranking data for the URL and anchor text pair.

Displays formatted and color-coded source and optional CSS information for each element.

Web color names browser/selector

When applied to a page it can help you see how the document was constructed without having to go back and forth between the sourcecode and the page in your browser. Is that list made of li, dd or p elements? Is that an h3 tag or just some bolded text?

Firebug is a javascript debugger. It packs all the tools you need to poke, prod, and monitor your JavaScript, CSS, HTML and Ajax into one seamless experience, including a debugger, an error console, command line, and a variety of fun inspectors.

My #1 extension no doubt.

Web Hosting - Cheap Web Hosting, Shared Webhosting, Reseller Hosting Web Hosting -Save by Hostgator Hosting Coupons, Web Hosting Coupon, Webhost Deals, Web Hostsiscounts, Offers, Hosting Rebates, Webhosting Companies Specials

Current SEOpen features are all accessed through right-clicking an open area on a web page or by using the new toolbar; they include:

* Yahoo Backlinks * Pages in Yahoo Index * Google Backlinks * Google Cache * Pages in Google index * Google Translate to English * Google Related * PageRank Check * MSN Backlinks * Pages in MSN Index * Alexa Overview * Alexa Traffic * Alexa Related * Alexa Backlinks * "Mass Check" multiple sources at once * Check DMOZ Inclusion * Keyword Density * Page Size Checker * HTML Validator * Server Header Viewer * Wayback Machine * Check robots.txt * Whois Info

Keyword finder, meta tag analyzer, link explorer, code cleaner, HTML validator, several SEO tools and more.

Launchy is a extension that will enable you to open current page, links, mailto, images and view source with external applications.

The Mozilla/Firefox Accessibility Extension makes it easier for people with a disability to view and navigate web content. Developers can use the toolbar to check their structural markup to make sure it matches the page content.

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

The Mozilla/Firefox Accessibility Extension makes it easier for people with a disability to view and navigate web content. Developers can use the toolbar to check their structural markup to make sure it matches the page content.