JavaScript

by Zulkarnain K.

25 Add-ons in this Collection

iMacros for Firefox by Ipswitch, Inc.

Rated 4 out of 5 stars 483 reviews

1,078,803 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!

Greasemonkey by Anthony Lieuallen, Aaron Boodman, others

Rated 4 out of 5 stars 1,080 reviews

1,044,867 users

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

JavaScript Debugger by James Ross, Robert Ginda, others

Rated 4 out of 5 stars 50 reviews

102,096 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.

JavaScript Deobfuscator by Wladimir Palant

Rated 5 out of 5 stars 22 reviews

42,237 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.

Scriptish by Erik Vold, Nils Maier, others

Rated 4 out of 5 stars 124 reviews

42,080 users

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

PrefBar by Manuel Reimer

Rated 5 out of 5 stars 41 reviews

13,274 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.

Custom Buttons by Yan, cubegm, others

Rated 4 out of 5 stars 118 reviews

33,352 users

Gives a possibility to create custom toolbarbuttons...

Execute JS by Rudolf Noe

Rated 5 out of 5 stars 15 reviews

4,384 users

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

JSONovich by mjgiarlo, Will Elwood

Rated 4 out of 5 stars 42 reviews

6,820 users

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

JavaScript Terminal by Paul Rouget

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Experimental

Rated 4 out of 5 stars 5 reviews

2,010 users

JavaScript Terminal for Firefox.

uc by matyr

Rated 5 out of 5 stars 14 reviews

1,158 users

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

Developer Assistant by Ted Mielczarek, Gavin Sharp, others

Rated 4 out of 5 stars 46 reviews

2,114 users

A suite of tools for developers.

Ubiquity by matyr

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Experimental

Rated 5 out of 5 stars 116 reviews

962 users

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

Javascript Command by max1million

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Experimental

Rated 4 out of 5 stars 13 reviews

1,015 users

For writing/testing javascript on Firefox windows (extension development, etc), web pages, and bookmarklets.

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.
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