JavaScript

by Zulkarnain K.

25 Add-ons in this Collection

Greasemonkey by Anthony Lieuallen, Aaron Boodman, others

Rated 4 out of 5 stars 1,213 reviews

916,165 users

Customize the way a web page displays or behaves, by using small bits of JavaScript.

iMacros for Firefox by Ipswitch, Inc.

Rated 4 out of 5 stars 553 reviews

834,817 users

Automate Firefox. Record and replay repetitive tasks. If you're tired of manually visiting the same sites, filling out forms, downloading files and extracting data, then iMacros is for you! Save time, effort and money with iMacros browser automation!

JavaScript Deobfuscator by Wladimir Palant

Rated 4 out of 5 stars 26 reviews

35,030 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.

JavaScript Debugger by James Ross, Robert Ginda, others

Rated 4 out of 5 stars 50 reviews

86,542 users

As of Firefox 33, Venkman *no longer works*, as the APIs which it needs have been removed.

Venkman is the code name for Mozilla's JavaScript Debugger. Venkman aimed to provide a powerful JavaScript debugging environment for Mozilla based browsers.

PrefBar by Manuel Reimer

Rated 5 out of 5 stars 38 reviews

12,319 users

The all in one toolbar(item). Houses and manages bigger amounts of buttons (Clear Cache, Clear Cookies, ...), Menus (User Agent spoof...) and checkboxes (Javascript, Flash, ...). Extensible from online-database or with self created buttons.

Scriptish by Erik Vold, Nils Maier, others

Rated 4 out of 5 stars 110 reviews

28,545 users

The greatest user script engine on the Internet (a fork of Greasemonkey).

Custom Buttons by Yan, cubegm, others

Rated 4 out of 5 stars 121 reviews

6,996 users

Gives a possibility to create custom toolbarbuttons...

JSONovich by mjgiarlo, Will Elwood

Rated 4 out of 5 stars 43 reviews

5,363 users

Pretty-prints JSON content in the browser for easy, unobtrusive viewing.

Developer Assistant by Ted Mielczarek, Gavin Sharp, others

Rated 4 out of 5 stars 46 reviews

1,642 users

A suite of tools for developers.

Ubiquity by matyr

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Experimental

Rated 5 out of 5 stars 118 reviews

652 users

An extension that allows for the use of dynamic commands in Firefox.

Execute JS by Rudolf Noe

Rated 5 out of 5 stars 15 reviews

3,266 users

Execute JS is a enhanced JavaScript-Console, where you can comfortably enter and execute arbitrary JavaScript-Code and modify functions...

uc by matyr

Rated 5 out of 5 stars 14 reviews

955 users

A userChromeJS clone with built-in subscript/overlay loader capability.

dotjs by Ricky Rosario

dotjs is a Firefox Add-on that executes JavaScript files in `~/.js` based on their filename and the domain of the site you are visiting.

JavaScript Terminal by Paul Rouget

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Experimental

Rated 4 out of 5 stars 5 reviews

1,595 users

JavaScript Terminal for Firefox.

Mozilla Labs - Jetpack Prototype by Mozilla Labs

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Experimental

Rated 4 out of 5 stars 27 reviews

3 users

Jetpack Prototype is an experiment in making it easy to build Firefox add-ons using common web technologies.
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