JavaScript

by Zulkarnain K.

25 Add-ons in this Collection

iMacros for Firefox by Ipswitch, Inc.

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!

Greasemonkey by Anthony Lieuallen

Rated 4 out of 5 stars 1,659 reviews

576,101 users

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

JavaScript Debugger by James Ross, Robert Ginda, others

Rated 4 out of 5 stars 52 reviews

50,267 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 26 reviews

17,594 users

Important note: This extension will not work in Firefox 57 and above. Providing this functionality in Firefox is no longer possible, the extension is discontinued.

PrefBar by Manuel Reimer

Rated 5 out of 5 stars 42 reviews

8,526 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 Will Elwood, mjgiarlo

Rated 4 out of 5 stars 47 reviews

4,163 users

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

Custom Buttons by Yan, cubegm, others

Rated 4 out of 5 stars 124 reviews

4,402 users

Gives a possibility to create custom toolbarbuttons...

Scriptish by Erik Vold, Nils Maier, others

Rated 4 out of 5 stars 109 reviews

14,130 users

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

Ubiquity by matyr

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Experimental

Rated 5 out of 5 stars 119 reviews

366 users

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

Execute JS by Rudolf Noe

Rated 5 out of 5 stars 15 reviews

1,629 users

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

Mozilla Labs - Jetpack Prototype by Mozilla Labs

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Experimental

Rated 4 out of 5 stars 27 reviews

17 users

Jetpack Prototype is an experiment in making it easy to build Firefox add-ons using common web technologies.

uc by matyr

Rated 5 out of 5 stars 15 reviews

571 users

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

Developer Assistant by Ted Mielczarek, Gavin Sharp, others

Rated 4 out of 5 stars 46 reviews

859 users

A suite of tools for developers.

Custom Buttons² by SCClockDr, nicholasalipaz, others

Rated 4 out of 5 stars 75 reviews

51 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...

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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