Artem's Essential Web Developer Add-ons

by Archon810

26 Add-ons in this Collection

Firebug by Joe Hewitt, Jan Odvarko, others

Rated 5 out of 5 stars 1,791 reviews

2,434,982 users

Firebug 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...

ColorZilla by Alex Sirota

Rated 5 out of 5 stars 305 reviews

315,709 users

Advanced Eyedropper, Color Picker, Gradient Generator and other colorful goodies...

User Agent Switcher by chrispederick

Rated 4 out of 5 stars 251 reviews

386,672 users

The User Agent Switcher extension adds a menu and a toolbar button to switch the user agent of a browser.

Web Developer by chrispederick

Rated 5 out of 5 stars 217 reviews

600,881 users

The Web Developer extension adds various web developer tools to the browser.

MeasureIt by Kevin Freitas

Rated 4 out of 5 stars 338 reviews

165,778 users

Draw a ruler across any webpage to check the width, height, or alignment of page elements in pixels.

IE Tab V2 (Enhanced IE Tab) by

Rated 4 out of 5 stars 417 reviews

615,993 users

Note: If you are encountering the Connecting... problem see instructions below.

The updated, fully supported IE Tab. Embed IE in a Firefox tab. IE Tab Features: FF 4+ support, IE 7-9 compatibility modes, old IE Tab settings import.

FirePath by Pierre Tholence

Rated 4 out of 5 stars 22 reviews

73,836 users

FirePath is a Firebug extension that adds a development tool to edit, inspect and generate XPath 1.0 expressions, CSS 3 selectors and JQuery selectors (Sizzle selector engine).

JavaScript Deobfuscator by Wladimir Palant

Rated 5 out of 5 stars 20 reviews

60,140 users

This add-on shows you what JavaScript code runs on a web page, even if it is obfuscated and generated on the fly. Simply open JavaScript Deobfuscator from the Web Developer menu and watch the scripts being compiled/executed.

JSONView by Ben Hollis

Rated 5 out of 5 stars 133 reviews

108,254 users

View JSON documents in the browser.

HackBar by Johan Adriaans, Pedro Laguna

Rated 4 out of 5 stars 41 reviews

32,456 users

Simple security audit / Penetration test tool.

YSlow by YSlow

Rated 3 out of 5 stars 195 reviews

108,047 users

YSlow analyzes web pages and suggests ways to improve their performance based on a set of rules for high performance web pages. is the official open source website.

Html Validator by Marc Gueury

Rated 4 out of 5 stars 200 reviews

63,453 users

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

For Online HTML 5 validation, you need 0.962

FirePHP by cadorn

Rated 4 out of 5 stars 46 reviews

54,901 users

FirePHP enables you to log to your Firebug Console using a simple PHP method call.

Not using Firebug 1.9+ on Firefox 8+? See

Firefinder for Firebug by Robert Nyman

Rated 3 out of 5 stars 28 reviews

24,056 users

Finds HTML elements matching chosen CSS selector(s) or XPath expression

View Cookies by Edwin Martin

Rated 4 out of 5 stars 43 reviews

30,665 users

It adds a tab to the Page Info dialog box, which shows the cookies belonging to the current page.
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