JavaScript

by Zulkarnain K.

25 Add-ons in this Collection

Greasemonkey by Anthony Lieuallen, Aaron Boodman, others

Rated 4 out of 5 stars 1,203 reviews

880,186 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 551 reviews

837,215 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

32,220 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.

PrefBar by Manuel Reimer

Rated 5 out of 5 stars 38 reviews

11,522 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.

JavaScript Debugger by James Ross, Robert Ginda, others

Rated 4 out of 5 stars 50 reviews

79,936 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 121 reviews

6,690 users

Gives a possibility to create custom toolbarbuttons...

Scriptish by Erik Vold, Nils Maier, others

Rated 4 out of 5 stars 110 reviews

27,025 users

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

JSONovich by mjgiarlo, Will Elwood

Rated 4 out of 5 stars 43 reviews

4,905 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

1,520 users

A suite of tools for developers.

Ubiquity by matyr

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Experimental

Rated 5 out of 5 stars 117 reviews

613 users

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

uc by matyr

Rated 5 out of 5 stars 14 reviews

924 users

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

Execute JS by Rudolf Noe

Rated 5 out of 5 stars 15 reviews

3,084 users

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

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.

Custom Buttons² by SCClockDr, nicholasalipaz, others

Rated 4 out of 5 stars 74 reviews

23 users

The Custom Buttons² Firefox extension provides the code base support necessary to create, maintain, import, and export custom toolbar buttons. The buttons can perform just about any task, with a large number of buttons already available on the exte...

XPCOMViewer by Ondřej Doněk

Rated 4 out of 5 stars 6 reviews

143 users

XPCOMViewer is tiny tool for exploring XPCOM components.
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