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

1,225,396 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

422,214 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

130,319 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

53,250 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

70,185 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

9,129 users

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

Custom Buttons by Yan, cubegm, others

Rated 4 out of 5 stars 86 reviews

74,037 users

Gives a possibility to create custom toolbarbuttons...

PrefBar by Manuel Reimer

Rated 5 out of 5 stars 39 reviews

15,682 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.

Execute JS by Rudolf Noe

Rated 5 out of 5 stars 13 reviews

5,409 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

1,192 users

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

JavaScript Terminal by Paul Rouget

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Experimental

Rated 4 out of 5 stars 5 reviews

3,263 users

JavaScript Terminal for Firefox.

Developer Assistant by Ted Mielczarek, Gavin Sharp, others

Rated 4 out of 5 stars 46 reviews

2,990 users

A suite of tools for developers.

dotjs by Ricky Rosario

Rated 4 out of 5 stars 10 reviews

831 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.

Ubiquity by matyr

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Experimental

Rated 5 out of 5 stars 120 reviews

1,147 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

2,031 users

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