JavaScript

by Zulkarnain K.

25 Add-ons in this Collection

Greasemonkey by Anthony Lieuallen, Aaron Boodman, others

Rated 4 out of 5 stars 933 reviews

1,374,341 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 366 reviews

299,271 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 Deobfuscator by Wladimir Palant

Rated 4 out of 5 stars 26 reviews

57,290 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 108 reviews

82,837 users

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

JavaScript Debugger by James Ross, Robert Ginda, others

Rated 4 out of 5 stars 48 reviews

179,935 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.

Custom Buttons by Yan, cubegm, others

Rated 4 out of 5 stars 82 reviews

91,851 users

Gives a possibility to create custom toolbarbuttons...

PrefBar by Manuel Reimer

Rated 5 out of 5 stars 36 reviews

16,684 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.

JSONovich by mjgiarlo, Will Elwood

Rated 4 out of 5 stars 30 reviews

9,036 users

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

Execute JS by Rudolf Noe

Rated 5 out of 5 stars 13 reviews

6,511 users

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

Developer Assistant by Ted Mielczarek, Gavin Sharp, others

Rated 4 out of 5 stars 46 reviews

3,582 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

4,418 users

JavaScript Terminal for Firefox.

uc by matyr

Rated 5 out of 5 stars 17 reviews

1,190 users

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

Javascript Command by max1million

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Experimental

Rated 4 out of 5 stars 13 reviews

2,886 users

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

JavaScript Object Examiner by Chuck_Baker

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Experimental

Not yet rated

1,721 users

Display JavaScript object methods and properties for any available scope.

Ubiquity by matyr

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Experimental

Rated 5 out of 5 stars 120 reviews

1,420 users

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