Web Development

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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)
4,404 weekly downloads

HackBar

Simple security audit / Penetration test tool.

Rated 5 out of 5 stars (39)
4,091 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)
4,073 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)
4,065 weekly downloads

Image Zoom

Adds zoom and rotation functionality for images...

Rated 4 out of 5 stars (327)
4,024 weekly downloads

JS Switch

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

Rated 4 out of 5 stars (20)
4,005 weekly downloads

Autofill Forms

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

Rated 3 out of 5 stars (388)
3,904 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)
3,749 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 (37)
3,666 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 (82)
3,654 weekly downloads

Cookie Importer

Imports cookies from a textfile.
Reads Netscape standard cookies.txt files as exported by IE and others.
Very useful in combination with the Cookie Exporter add-on.

Rated 5 out of 5 stars (2)
3,631 weekly downloads

Custom User-Agent String No Restart

Set custom User-Agent string. Also available for Firefox on Android.

Rated 3 out of 5 stars (7)
3,551 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)
3,550 weekly downloads

Wappalyzer No Restart

Wappalyzer is a browser extension that identifies software on websites.

Rated 4 out of 5 stars (95)
3,453 weekly downloads

Tab Data (+Memory usage) No Restart

Provides user with tab related stats and memory usage

Rated 5 out of 5 stars (19)
3,378 weekly downloads

Empty Cache Button Featured

Cache clearing made easy. One click.

Rated 4 out of 5 stars (80)
3,313 weekly downloads

Autofill

Autofill is a small but powerful add-on that serves one purpose: fill form fields automatically on page load. It is for people who just want a straightforward form filler without all the bells and whistles.

Rated 3 out of 5 stars (47)
3,213 weekly downloads

User-Agent Switcher No Restart

Quickly and easily switch between popular user-agent strings.

Rated 4 out of 5 stars (5)
3,108 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 (165)
3,090 weekly downloads

Text Link

Allows URI texts written in webpages to be loaded by double clicks.

Rated 4 out of 5 stars (270)
3,053 weekly downloads