Firefox Extensions For Webmasters

To develop a Web application, to design a dynamic Web page with precision, find sources of errors and have a view on the state of exchanges between the browser and the server, Firefox may be transformed into a software programming and a testing tool thanks to these extensions.

Development and debugging

Firebug
Debugger for JavaScript and Ajax. Shows the contents of the exchanges between the browser and the server.

The Web Developer
A menu added to Firefox includes several tools.

Console2
Displays errors in JavaScript, DOM, CSS. Other improvements on the builtin console.

LiveHTTPHeaders
Viewing HTTP headers when loading a page for each component as well as cookies created by sites on your computer.

Modify Headers
Using HTTP headers. Lets you create ones.

Publishing and development

View Formatted Source
Displaying the HTML source code indented and colorized.

View Source Chart
Displays the DOM after changes and the structure of the document. Replaces DOM Inspector.

Font Finder
Show CSS styles for selected content items and lets you know how it was achieved.

ColorZilla
Takes a color on the page to allow for use elsewhere. Proposes a palette.

MeasureIt
Displaying a rule to adjust sizes.

Load Time Analyzer
Gives loading time of each element of a page.

SEO and links

SEO Quake
Adding a toolbar with numerous indications about the importance of a site or a page. Backlinks, number of bookmarks on Del.icio.us... Works with Firefox and Internet Explorer.

Link Analysis
Completed Google Tools for Webmasters. When you click on the list of backlinks to a given page, displays of PR backlinks and those which have disappeared (mainly from RSS files).

LinkChecker
Check to see if the page contains broken links.

Search Status
Displays the PageRank and Alexa rank for the current page. Highlight links in nofollow on visited pages. The drop-down menu also gives access to several other infos about the website.

iWebTool
Provides access to some thirty tools especially on the links and the position of the site. Availability of a domain name. Extracting HTML contents.

Compatibility

IE Tab
Displaying the page as on Internet Explorer.

HTML Validator
Includes a compatibily checking feature for the HTML code and compliance with the standard.

CSS Validator
Includes a function to validate style sheets with the W3C tool.

Quick Locale Switcher
Change the language of the browser.

XML

XmlDeveloper
Help for XHTML pages with a specialized XML toolbar.

The XPather
Using XPath.

Mobiles

XHTML-MP
Displays the sites's contents in mime type of mobiles: 'application/vnd.wap.xhtml+xml".