JavaScript

by Zulkarnain K.

25 Add-ons in this Collection

Greasemonkey by Anthony Lieuallen, Aaron Boodman, others

Rated 4 out of 5 stars 1,036 reviews

1,193,634 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 456 reviews

920,271 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 Debugger by James Ross, Robert Ginda, others

Rated 4 out of 5 stars 50 reviews

115,117 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

50,089 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 123 reviews

53,708 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

16,120 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 124 reviews

58,133 users

Gives a possibility to create custom toolbarbuttons...

JavaScript Terminal by Paul Rouget

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Experimental

Rated 4 out of 5 stars 5 reviews

2,387 users

JavaScript Terminal for Firefox.

Execute JS by Rudolf Noe

Rated 5 out of 5 stars 15 reviews

5,236 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 38 reviews

8,749 users

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

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.

Developer Assistant by Ted Mielczarek, Gavin Sharp, others

Rated 4 out of 5 stars 46 reviews

2,640 users

A suite of tools for developers.

Ubiquity by matyr

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Experimental

Rated 5 out of 5 stars 127 reviews

1,240 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

1,280 users

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

uc by matyr

Rated 5 out of 5 stars 21 reviews

1,369 users

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