Web Development

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Random Agent Spoofer No Restart

Rotates complete browser profiles ( from real browsers / devices ) at a user defined time interval. It includes many extra privacy enhancing options

Rated 5 out of 5 stars (83)
4,384 weekly downloads

HackBar

Simple security audit / Penetration test tool.

Rated 4 out of 5 stars (41)
4,308 weekly downloads

IE Tab + (FF 8+, 7, 6, 5, 4, 3.6, 3.5, SeaMonkey)

IE Tab + is an enhanced version of IE Tab. It supports FF 3.5 or greater, integrates IE Tab with Adblock Plus in the IE Tab engine, and synchronizes cookies between IE and Firefox. You can easily import settings from the original IE Tab into IE Tab +

Rated 3 out of 5 stars (83)
4,270 weekly downloads

HttpRequester

A tool for easily making HTTP requests (GET/PUT/POST/DELETE), viewing the responses, and keeping a history of transactions.

Rated 4 out of 5 stars (43)
4,229 weekly downloads

Autofill Forms

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

Rated 3 out of 5 stars (393)
4,205 weekly downloads

colorPicker No Restart

A very simple extension for learning web page colors. Copy the RGB or Hex color code of any pixel displayed in your browser to the clipboard (in CSS/HTML format). Similar in function to Internet Explorer's color picker.

Rated 4 out of 5 stars (29)
4,198 weekly downloads

SeoQuake SEO extension

Seoquake is a Firefox SEO extension aimed primarily at helping web masters who deal with search engine optimization (SEO), social media optimization (SMO) and internet promotion. Seoquake allows to investigate many important SEO parameters.

Rated 4 out of 5 stars (207)
4,188 weekly downloads

Java Console 5.0.12

Java Console Extension for Java SE 1.5.0_12 (version 5 update 12).

Rated 1 out of 5 stars (7)
4,115 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 (192)
4,093 weekly downloads

Image Zoom

Adds zoom and rotation functionality for images...

Rated 4 out of 5 stars (330)
4,048 weekly downloads

Selenium Expert (Selenium IDE)

This plugin is my attempt to bring the wonderful world of inspections, tips, hints, fixes and refactoring to Selenese! The Selenium Expert goes through your selenium test cases suggesting improvements, giving tips and even lets you apply them.

Rated 5 out of 5 stars (1)
3,991 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)
3,907 weekly downloads

RefControl

Control what gets sent as the HTTP Referer on a per-site basis.

Rated 4 out of 5 stars (179)
3,889 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 (71)
3,746 weekly downloads

Wappalyzer No Restart

Wappalyzer is a browser extension that identifies software on websites.

Rated 4 out of 5 stars (98)
3,650 weekly downloads

Disable WebRTC No Restart

WebRTC exposes your internal network IP(s), without user interaction.

Rated 4 out of 5 stars (20)
3,618 weekly downloads

Firefox OS 1.1 Simulator No Restart

Firefox OS Simulator is a test environment for Firefox OS. Use it to test your apps in a Firefox OS-like environment that looks and feels like a mobile phone. After installing it, go to Web Developer > Firefox OS Simulator to access its features.

Rated 4 out of 5 stars (63)
3,155 weekly downloads

Auto Refresh

Auto Refresh will refresh or hard refresh any tab or group of tabs at individual or group intervals.

You can also customize your presets and save the ones you most use.

http://www.grizzlyape.com/addons/auto-refresh/

Rated 3 out of 5 stars (35)
3,077 weekly downloads

Pearl Crescent Page Saver screenshot tool

Save an image of a web page (including Flash content) to a file. Web page screenshots may be captured interactively or from the command line. Options allow you to control the output format (PNG or JPEG), image file name, scaling, and much more.

Rated 4 out of 5 stars (78)
2,928 weekly downloads

Lightshot (screenshot tool) No Restart

Easy and convenient screenshot tool. Allows you to make screenshots of any selected area (video and flash too), edit and upload it to server.

Rated 5 out of 5 stars (173)
2,881 weekly downloads