Web Development

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JavaScript Deobfuscator

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 5 out of 5 stars (22)
2,135 weekly downloads

User Agent Switcher Compatible with Firefox 57+

Easily override the browser's User-Agent string

Rated 5 out of 5 stars (10)
2,035 weekly downloads

Advanced Cookie Manager Requires Restart

A must have tool for Web Developers and Testers to Manage and monitor web cookies.

Features List:
Add
Delete
Modify
Export / Backup
Import / Restore
Monitor cookies

Available in English, French, Spanish, German and Italian languages.

Rated 4 out of 5 stars (37)
2,030 weekly downloads

The Addon Bar (Restored)

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

Rated 5 out of 5 stars (326)
1,934 weekly downloads

Pearl Crescent Page Saver screenshot tool Requires Restart

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 (82)
1,862 weekly downloads

Poster Requires Restart

A developer tool for interacting with web services and other web resources that lets you make HTTP requests, set the entity body, and content type. This allows you to interact with web services and inspect the results...

Rated 4 out of 5 stars (62)
1,788 weekly downloads

ICPBravoAccess Compatible with Firefox 57+

ICPBravo Access ICPBrasil and General PKI Extension.

Rated 4 out of 5 stars (3)
1,787 weekly downloads

Edit Cookies Requires Restart

This extension is now being partly maintained by Abine http://www.abine.com/.
New version of Edit Cookies by us is here: http://abine.com/edit_cookies.php
Send us any feedback about what you want:support@getabine.com.

Rated 4 out of 5 stars (51)
1,756 weekly downloads

User-Agent Switcher (revived) Compatible with Firefox 57+

Quickly and easily switch between popular user-agent strings.

Rated 4 out of 5 stars (10)
1,753 weekly downloads

Font Finder Requires Restart Featured

FontFinder is created for designers, developers and typographers. It allows a user to analyze the font information of any element on a page, copy any piece(s) of that information to the clipboard, and perform inline replacements to test new layouts.

Rated 4 out of 5 stars (75)
1,736 weekly downloads

Favorites (Selenium IDE) Requires Restart

A plugin for Selenium-IDE to have favorite test suites and open and execute the test suites with a single click

Rated 4 out of 5 stars (4)
1,730 weekly downloads

Auto Refresh Requires Restart

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 (48)
1,730 weekly downloads

React Developer Tools

React Developer Tools is a tool that allows you to inspect a React tree, including the component hierarchy, props, state, and more. To get started, just open the Firefox devtools and switch to the React tab.

Rated 5 out of 5 stars (8)
1,726 weekly downloads

YSlow Requires Restart

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 (221)
1,725 weekly downloads

Classic Toolbar Buttons Featured

'Classic Toolbar Buttons' add-on restores old toolbar button ui (known from Fx 4-7s small view, Fx 4-12s large view & Tb 5-14) for current Firefox, Thunderbird and Seamonkey versions.

Beta builds on versions page!

Rated 5 out of 5 stars (133)
1,655 weekly downloads

Empty Cache Button Requires Restart

Cache clearing made easy. One click.

Rated 4 out of 5 stars (88)
1,651 weekly downloads

Autofill Requires Restart

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 (59)
1,638 weekly downloads

CacheViewer Requires Restart

This extenion is GUI Front-end of "about:cache"...

Rated 4 out of 5 stars (220)
1,631 weekly downloads

XPath Checker Requires Restart

An interactive editor for XPath expressions.

Rated 5 out of 5 stars (22)
1,624 weekly downloads

SAML tracer

Debug and view SAML messages

Rated 4 out of 5 stars (7)
1,596 weekly downloads