JavaScript

by Zulkarnain K.

25 Add-ons in this Collection

Greasemonkey by Anthony Lieuallen

Rated 4 out of 5 stars 1,595 reviews

672,702 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 1,146 reviews

468,085 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 51 reviews

59,811 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 124 reviews

9,161 users

Gives a possibility to create custom toolbarbuttons...

JavaScript Deobfuscator by Wladimir Palant

Rated 5 out of 5 stars 26 reviews

21,490 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.

Scriptish by Erik Vold, Nils Maier, others

Rated 4 out of 5 stars 109 reviews

17,387 users

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

PrefBar by Manuel Reimer

Rated 5 out of 5 stars 42 reviews

9,408 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

4,982 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.

Ubiquity by matyr

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Experimental

Rated 5 out of 5 stars 118 reviews

461 users

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

uc by matyr

Rated 5 out of 5 stars 15 reviews

638 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

1,090 users

A suite of tools for developers.

JSLinter by Roland Warmerdam

Rated 5 out of 5 stars 1 review

96 users

Analyses all the Javascript files on a web page using JSLint.

Execute JS by Rudolf Noe

Rated 5 out of 5 stars 15 reviews

2,015 users

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

JavaScript Object Examiner by Chuck_Baker

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Experimental

Not yet rated

296 users

Display JavaScript object methods and properties for any available scope.
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