Mozilla Firefox has become the most powerful, renowned and a web browser used by millions across the world. Each and every internet user uses a web browser to surf on internet. But when it comes to web development, web browsers are crucial for the guys in web development process. They have to keep an eye on all web browsers to check if there’s any web displaying problem with their website while using a browser. Being a graphics designer and web developer, dealing with these web browsers to ensure the right arrangement and error free website has become my routine.

Searching for errors and optimizing your pages is a real pain and time consuming. But now for Firefox there are tons of add-ons that makes web developers’ life much easier. During my whole career I came to many Firefox add-ons, I used them, removed the less productive ones and kept the most powerful Firefox add-ons. In this post, I am going to share, with you guys, all those Firefox add-ons that make a web developer’s life a real ease. These add-ons or extensions are also called in-browser tools.

Below is the list of Best Firefox Add-ons for Web Developers:

Firebug, a Firefox add-on, integrates with Firefox to put a wealth of development tools at your fingertips while you browse. You can edit, debug, and monitor CSS, HTML, and JavaScript live in any web page…”


Web Developer Adds a menu and a toolbar with various web developer tools.”


“Along with transferring your files quickly and efficiently, FireFTP also includes more advanced features such as: directory comparison, syncing directories while navigating, SFTP, SSL encryption, search/filtering, integrity checks, remote editing, drag & drop, file hashing, and much more!”


User Agent Switcher Adds a menu and a toolbar button to switch the user agent of the browser.”


Screengrab saves entire webpages as images. It will save what you can see in the window, the entire page, just a selection, a particular frame… basically it saves webpages as images.

The following little keywords are at the request of those who can’t remember the name ScreenGrab! and want searches to work. It takes screen shots, screenshots – that is, shots, of web pages.”


Flash Switcher switch between various flash player versions. Also save or remove the current installed plugin.”


HTML Validator is a Mozilla extension that adds HTML validation inside Firefox and Mozilla. The number of errors of a HTML page is seen on the form of an icon in the status bar when browsing.

The extension can validate the HTML sent by the server or the HTML in the memory (after Ajax execution)…”


“Performance and network tweaks for Firefox.

Fasterfox allows you to tweak many network and rendering settings such as simultaneous connections, pipelining, cache, DNS cache, and initial paint delay.

Dynamic speed increases can be obtained with the unique prefetching mechanism, which recycles idle bandwidth by silently loading and caching all of the links on the page you are browsing.”

FireShot is a Firefox extension that creates screenshots of web pages.

Unlike other extensions, this plugin provides a set of editing and annotation tools, which let users quickly modify web captures and insert text annotations and graphical annotations. Such functionality will be especially useful for web designers, testers and content reviewers.

It’s possible to choose whether you want to capture entire web page or take screenshot of only visible part of the web page.

The captures can be:

  • uploaded to FREE public screenshot hosting
  • saved to disk (PNG, GIF, JPEG, BMP)
  • printed
  • copied to clipboard
  • e-mailed
  • sent to configurable external editor for further processing.”


“Winner of the “2006 PC World World Class Award”, NoScript tool provides extra protection to your Firefox. It allows JavaScript, Java and other executable content to run only from trusted domains of your choice, e.g. your home-banking web site, guarding your “trust boundaries” against cross-site scripting attacks (XSS) and Clickjacking attempts, thanks to its unique ClearClick technology.

Such a preemptive approach prevents exploitation of security vulnerabilities (known and even unknown!) with no loss of functionality…

Experts do agree: Firefox is really safer with NoScript ;-)”


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


YSlow gives you:

  • Performance report card
  • HTTP/HTML summary
  • List of components in the page
  • Tools including JSLint

YSlow is licensed under the Mozilla Public License (MPL) version 1.1, with portions licensed by third parties under other license terms. To review the terms before installing, see”


SEO for Firefox is an excellent plugin for those, who like to watch statistics into Yahoo and Google search results. You can get Alexa, Tehnorati, Google PR, rankings and many other useful data. This is an add-on you cannot live without.

Home Page

“If you use Firefox on more than one computer, you’ll want Foxmarks Bookmark Synchronizer. Install Foxmarks on each computer, and it works silently in the background to keep your bookmarks and (optionally) passwords synchronized. Foxmarks also keeps your data backed up and safe from computer failures. If you’re away from your computer, Foxmarks allows you to access your bookmarks online by logging into”


Aardvark is a powerful and user-friendly selector utility for selecting elements and doing various actions on them. It can be used for cleaning up a page prior to printing it (by removing and isolating elements), and for web development.”


Tab Mix Plus enhances Firefox’s tab browsing capabilities. It includes such features as duplicating tabs, controlling tab focus, tab clicking options, undo closed tabs and windows, plus much more. It also includes a full-featured session manager with crash recovery that can save and restore combinations of opened tabs and windows.”


Dummy Lipsum generates “Lorem Ipsum” dummy text (from Minimum text length: 5 words. Context menu option on form inputs (“Insert Dummy Lipsum”). This option fills automatically the selected field.”


  • Preview web links, images, and videos without even clicking.
  • View Google & Yahoo Image Search in ultra slideshow mode
  • Instantly send links to friends and family with just a click.
  • Automatically subsearch Google, Wikipedia, and many others by right-clicking on any phrase
  • Customize preferences to control preview window activation, time delay, size & position, etc.

“Created by the developers of CoolPreviews (formerly PicLens), the ever-popular Firefox addon that gives you stunning, full-screen 3D views across the web.”


Clippings Saves and manages frequently-entered text for later pasting into Web page forms in Firefox or email and newsgroup messages in Thunderbird. Pasting a clipping is accomplished with just two mouse clicks, eliminating the hassle of retyping or repetitive copying and pasting.”


2 Responses to “Best Firefox Add-ons for Web Developers”

  1. It’s really informative and useful for web developers. Keep posting. Thanks.

  2. Hi. Good site.


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