Web Development

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Microsoft .NET Framework Assistant

Adds ClickOnce support and the ability to report installed .NET versions to the web server.

Rated 2 out of 5 stars (118)
9,419 weekly downloads

ColorZilla

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

Rated 5 out of 5 stars (300)
8,914 weekly downloads

FirePath

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).

Rated 4 out of 5 stars (22)
8,426 weekly downloads

Nimbus Screen Capture - editable screenshots No Restart Featured

Screen capture Web Page, selected region or whole browser window, edit screenshots and save the images to Local File or Google Drive. Edit screenshots in a very user-friendly interface with the different tools.

Rated 5 out of 5 stars (142)
8,030 weekly downloads

Live HTTP Headers

View HTTP headers of a page and while browsing.

Rated 4 out of 5 stars (154)
8,022 weekly downloads

Fire IE (FireIE, Enhanced IE)

Embeds Internet Explorer(IE) to use the powerful Firefox add-ons.
Not only an enhanced IE Tab, but also an enhanced Internet Explorer with Adblock Plus and FireGestures support.
Switch to the IE engine in one click and dismiss your IE.

Rated 4 out of 5 stars (129)
8,003 weekly downloads

IE Tab

IE Tab - an extension from Taiwan, features: Embedding Internet Explorer in tabs of Mozilla/Firefox...

Rated 4 out of 5 stars (1,185)
7,241 weekly downloads

Screengrab (fix version) Featured

Screengrab! saves webpages as images.
0.98 released!
New features: upload to internet

Rated 5 out of 5 stars (241)
7,131 weekly downloads

MeasureIt

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

Rated 4 out of 5 stars (328)
6,146 weekly downloads

ColorfulTabs Featured

The most beautiful yet the simplest add-on that makes a strong colorful appeal. Colors every tab in a different color and makes them easy to distinguish while beautifying the overall appearance of the interface. For Seamonkey & Flock. An essential. F...

Rated 4 out of 5 stars (969)
6,009 weekly downloads

The Addon Bar (Restored) No Restart Featured

Gives you a place to put all your add-on buttons without over-crowding the navigation bar.

Rated 5 out of 5 stars (264)
5,798 weekly downloads

JavaScript Deobfuscator No Restart

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.

Rated 4 out of 5 stars (26)
5,661 weekly downloads

JSONView No Restart

View JSON documents in the browser.

Rated 5 out of 5 stars (126)
5,015 weekly downloads

HttpFox

An HTTP analyzer addon for Firefox

Rated 4 out of 5 stars (161)
4,990 weekly downloads

YSlow

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

Rated 3 out of 5 stars (186)
4,919 weekly downloads

User Agent Overrider No Restart

Override browser user agent string

Rated 4 out of 5 stars (40)
4,533 weekly downloads

Modify Headers

Add, modify and filter the HTTP request headers sent to web servers. This addon is particularly useful for Mobile web development, HTTP testing and privacy.

Rated 4 out of 5 stars (70)
4,499 weekly downloads

JS Switch

Add a toolbar button or an option in Tool menu to toggle JavaScript

Rated 4 out of 5 stars (20)
4,495 weekly downloads

Autofill Forms

Autofill Forms enables you to fill out web forms with one click.

Rated 3 out of 5 stars (390)
4,458 weekly downloads

Tiny JavaScript Debugger

TinyJSD is a JavaScript debugger for privileged code running Mozilla products like Firefox, Thunderbird, SeaMonkey. It serves to debug the application as well as extensions written in JavaScript.

Rated 4 out of 5 stars (5)
4,382 weekly downloads