Top 10 useful Mozilla tools for developers

Web Developer

The Web Developer extension adds various web developer tools to the browser.


Firebug integrates with Firefox to put a wealth of web development tools at your fingertips while you browse.
You can edit, debug, and monitor CSS, HTML, and JavaScript live in any web page

DOM Inspector

Inspect the DOM of HTML, XUL, and XML pages, including the mail…

SQLite Manager

Manage any SQLite database on your computer.

JavaScript Deobfuscator

This add-on will show you what JavaScript gets to run on a web page, even if it is obfuscated and generated on the fly.
Simply open JavaScript Deobfuscator from the Tools menu and watch the scripts being compiled/executed.

User Agent Switcher

The User Agent Switcher extension adds a menu and a toolbar button to switch the user agent of a browser.


The best security you can get in a web browser! Allow active content to run only from sites you trust,
and protect yourself against XSS and Clickjacking attacks.


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


Allows editing of the web page content while in Print Preview mode. Editing the web page prior to printing can
compact the layout and remove unwanted content such as adverts, sidebars and blank pages. Any element can be
formatted, hidden or deleted.


Simple security audit / Penetration test tool.
This toolbar will help you in testing sql injections, XSS holes and site security. It is NOT a tool for executing standard exploits and
it will NOT teach you how to hack a site. Its main purpose is to help a developer do security audits on his code. If you know what your doing,
this toolbar will help you do it faster. If you want to learn to find security holes, you can also use this toolbar, but you will probably also
need a book, a lot of Google and a brain :)


YSlow analyzes web pages and why they’re slow based on Yahoo!’s rules for high performance web sites.YSlow analyzes web pages and suggests ways to improve their performance based on a set of rules for high performance web pages.
YSlow is a Firefox add-on integrated with the Firebug web development tool. YSlow grades web page based on one of three predefined ruleset or a user-defined ruleset.

SQL Inject Me

SQL Injection vulnerabilites can cause a lot of damage to a web application. A malicious user can possibly view records, delete records,
drop tables or gain access to your server. SQL Inject-Me is Firefox Extension used to test for SQL Injection vulnerabilities.


A tool for easily making HTTP requests (GET/PUT/POST/DELETE), viewing the responses, and keeping a history of transactions.


Cross-Site Scripting (XSS) is a common flaw found in todays web applications. XSS flaws can cause serious damage to a web application.
Detecting XSS vulnerabilities early in the development process will help protect a web application
from unnecessary flaws. XSS-Me is the Exploit-Me tool used to test for reflected XSS vulnerabilities.


The easiest way to find the break points in your responsive designs

User Style Manager

Easiest way to Add and Manage Custom User Styles in Firefox.
Add, Edit, enable, disable and delete in-numerous User Style Sheets to redesign the Firefox and the Web.


Track your GitHub repos and issues from within Firefox!


Parasite is a simple extension that enables switching the same page between hosting environments.
In other words, open the same file path on a different domain name. Useful when working on a Web project
that has multiple hosts/staging servers.

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