JavaScript

by Zulkarnain K.

25 Add-ons in this Collection

Greasemonkey by Anthony Lieuallen, Aaron Boodman, others

Rated 4 out of 5 stars 998 reviews

1,235,845 users

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

iMacros for Firefox by Ipswitch

Rated 4 out of 5 stars 399 reviews

495,223 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

114,054 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

53,108 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 119 reviews

61,634 users

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

JSONovich by mjgiarlo, Will Elwood

Rated 4 out of 5 stars 36 reviews

9,822 users

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

PrefBar by Manuel Reimer

Rated 5 out of 5 stars 39 reviews

15,714 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 101 reviews

61,640 users

Gives a possibility to create custom toolbarbuttons...

Execute JS by Rudolf Noe

Rated 5 out of 5 stars 13 reviews

5,123 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

2,892 users

A suite of tools for developers.

uc by matyr

Rated 5 out of 5 stars 19 reviews

1,286 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

2,572 users

JavaScript Terminal for Firefox.

Ubiquity by matyr

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Experimental

Rated 5 out of 5 stars 125 reviews

1,213 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

1,476 users

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

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.
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