JavaScript

by Zulkarnain K.

25 Add-ons in this Collection

Greasemonkey by Anthony Lieuallen, Aaron Boodman, others

Rated 4 out of 5 stars 956 reviews

1,230,597 users

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

iMacros for Firefox by iMacros

Rated 4 out of 5 stars 378 reviews

396,444 users

Automate Firefox. Record and replay repetitious work. If you love the Firefox web browser, but are tired of repetitive tasks like visiting the same sites every days, filling out forms, and remembering passwords, then iMacros for Firefox is the soluti...

JavaScript Debugger by James Ross, Robert Ginda, others

Rated 4 out of 5 stars 50 reviews

132,550 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 20 reviews

54,188 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 113 reviews

70,383 users

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

JSONovich by mjgiarlo, Will Elwood

Rated 4 out of 5 stars 33 reviews

9,212 users

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

PrefBar by Manuel Reimer

Rated 5 out of 5 stars 39 reviews

15,803 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 86 reviews

74,223 users

Gives a possibility to create custom toolbarbuttons...

Execute JS by Rudolf Noe

Rated 5 out of 5 stars 13 reviews

5,475 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 18 reviews

1,201 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

3,064 users

A suite of tools for developers.

JavaScript Terminal by Paul Rouget

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Experimental

Rated 4 out of 5 stars 5 reviews

3,332 users

JavaScript Terminal for Firefox.

Ubiquity by matyr

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Experimental

Rated 5 out of 5 stars 120 reviews

1,197 users

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

dotjs by Ricky Rosario

Rated 4 out of 5 stars 10 reviews

832 users

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 Command by max1million

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Experimental

Rated 4 out of 5 stars 13 reviews

2,050 users

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