Web Development

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CodeBurner for Firebug Requires Restart

CodeBurner is a Firefox add-on that integrates with Firebug, to extend it with reference material for HTML and CSS.

Rated 3 out of 5 stars (35)
3,614 weekly downloads

MeasureIt Requires Restart

Draw a ruler across any webpage to check the width, height, or alignment of page elements in pixels.

Rated 4 out of 5 stars (343)
3,468 weekly downloads

Speed Tweaks (SpeedyFox)

This extension provides a list to almost all the settings that you may need to alter in order to enhance Firefox's speed.

Rated 5 out of 5 stars (99)
3,420 weekly downloads

HackBar Requires Restart

Simple security audit / Penetration test tool.

Rated 4 out of 5 stars (57)
3,228 weekly downloads

User Agent Switcher Compatible with Firefox 57+

Easily override the browser's User-Agent string

Rated 4 out of 5 stars (29)
3,145 weekly downloads

React Developer Tools Compatible with Firefox 57+

React Developer Tools is a tool that allows you to inspect a React tree, including the component hierarchy, props, state, and more. To get started, just open the Firefox devtools and switch to the React tab.

Rated 4 out of 5 stars (10)
3,140 weekly downloads

WhatRuns Compatible with Firefox 57+

Discover what runs a website - This Firefox extension helps you identify technologies used on any website at the click of a button.

Rated 5 out of 5 stars (16)
3,082 weekly downloads

ColorfulTabs Requires Restart

The first addon you should be installing on a fresh Firefox install. A must have. The most beautiful yet the simplest add-on that makes a strong colorful appeal. Colors every tab in a different color.

Rated 4 out of 5 stars (971)
2,922 weekly downloads

Firefinder for Firebug Requires Restart

Finds HTML elements matching chosen CSS selector(s) or XPath expression

Rated 3 out of 5 stars (28)
2,865 weekly downloads

SeoQuake SEO extension

Accelerate your SEO efforts on the fly. SEOquake is a free plugin for browsers that provides you with key SEO metrics for a specific page, along with other useful tools such as SEO Audit and many others.

Rated 4 out of 5 stars (218)
2,862 weekly downloads

One Click Proxy IP

The easiest way ever to change IP and browse anonymously! Just activate it with one click and it's done, you're browsing the web with a random HTTP or Socks proxy list from several countries in the world. No ads. 100% free to prevent web censorship.

Rated 4 out of 5 stars (39)
2,818 weekly downloads

The Addon Bar (Restored)

Gives you a place to put all your add-on buttons without over-crowding the navigation bar.

Rated 5 out of 5 stars (378)
2,765 weekly downloads

Open in Tor Browser Compatible with Firefox 57+

Open current page or link in tor browser for better privacy

Rated 4 out of 5 stars (45)
2,757 weekly downloads

User-Agent Switcher (revived) Compatible with Firefox 57+

Quickly and easily switch between popular user-agent strings.

Rated 4 out of 5 stars (14)
2,717 weekly downloads

JavaScript Toggle On and Off (WebExtension) Compatible with Firefox 57+

Toggle JavaScript engine on and off the easy way

Rated 4 out of 5 stars (17)
2,711 weekly downloads

JSONView

View JSON documents in the browser.

Rated 5 out of 5 stars (177)
2,667 weekly downloads

Download all Images Compatible with Firefox 57+ Featured

a customizable extension to save the images from the current tab page

Rated 4 out of 5 stars (8)
2,659 weekly downloads

Live HTTP Headers (clone)

View HTTP headers of a page and while browsing.

This is an unofficial "Live HTTP headers" clone, mainly to fix the Replay feature!

Rated 4 out of 5 stars (10)
2,641 weekly downloads

Advanced Cookie Manager Requires Restart

A must have tool for Web Developers and Testers to Manage and monitor web cookies.

Features List:
Add
Delete
Modify
Export / Backup
Import / Restore
Monitor cookies

Available in English, French, Spanish, German and Italian languages.

Rated 4 out of 5 stars (34)
2,604 weekly downloads

JavaScript Toggle On and Off

Toggle JavaScript engine on and off the easy way

Rated 4 out of 5 stars (13)
2,574 weekly downloads