Page 0 of 15 for most used Firefox add-on in the Web Development category in Firefox Browser Add-ons

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Web Development

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Add-ons (also known as extensions) are small programs that run inside web browsers like Mozilla Firefox. They add extra features to the browser without having to download anything new. You can use extensions to make browsing faster, easier, and safer. Some extensions even let you do things like translate text on websites, search the web, and play games.

There are over 28,000 Firefox-addons and 480,000 themes, making it hard to find the best ones. so we have created a way to sort through all of them. Use the dropdown above to set different filters. Add-ons are sorted by number of active users.

To set even more advanced filters, and sort the Firefox add-ons differently, please visit our Advanced search tool. Note that Advanced search tool is only available to premium members.

#1, Dark Reader

Dark Reader Ltd

Dark mode for every website. Take care of your eyes, use dark theme for night and daily browsing.

4.53 (5,602)

1,158,716

#2, Ghostery – Privacy Ad Blocker

Ghostery

Ghostery is a powerful privacy extension. Block ads, stop trackers and speed up websites.

4.30 (4,178)

1,029,758

#3, FoxyProxy Standard

Eric

FoxyProxy is an open-source, advanced proxy management tool that completely replaces Firefox's limited proxying capabilities. No paid accounts are necessary; bring your own proxies or buy from any vendor. The original proxy tool, since 2006.

3.95 (825)

203,614

#4, Flagfox

Dave G

Displays a country flag depicting the location of the current website's server and provides a multitude of tools such as site safety checks, whois, translation, similar sites, validation, URL shortening, and more...

4.64 (962)

114,024

#5, Stylus

Stylus Team

Redesign your favorite websites with Stylus, an actively developed and community driven userstyles manager. Easily install custom themes from popular online repositories, or create, edit, and manage your own personalized CSS stylesheets.

4.68 (1,018)

109,769

#6, Disconnect

Disconnect

Make the web faster, more private, and more secure.

4.14 (478)

94,889

#7, User-Agent Switcher and Manager

Ray

Spoof websites trying to gather information about your web navigation—like your browser type and operating system—to deliver distinct content you may not want.

4.23 (651)

93,557

#8, Download All Images

Joe Ertaba

Easily save images with a wide range of customization features, such as file size, dimensions, and image type.

3.91 (561)

88,381

#9, Tab Reloader (page auto refresh)

James Fray

An easy-to-use tab reloader with custom reloading time settings for individual tabs

4.02 (390)

77,079

#10, Clear Cache

TenSoja

Clear browser cache with a single click or via the F9 key. F9 Fever! ;)

4.43 (258)

62,287

#11, Measure-it

Trishul

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

4.45 (119)

26,398

#12, Clear Browsing Data

Armin Sebastian

Delete browsing data directly from the browser toolbar. Clear cookies, history and cache with a single click.

4.40 (175)

18,640

#13, Stylebot

Ankit Ahuja

Change the appearance of the web instantly

4.76 (82)

12,829

#14, Tampermonkey

Jan Biniok

Tampermonkey is the world's most popular userscript manager.

4.70 (4,729)

674,741

#15, React Developer Tools

React

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 "⚛️ Components" or "⚛️ Profiler" tab.

4.63 (344)

185,213

#16, FireShot: Full Web Page Screenshots (♥♥♥♥♥)

susbox

FireShot makes full page screen captures - http://bit.ly/RlBQMV Screenshots are quickly captured and: ― Saved as Image / PDF with links and text ― Sent to clipboard ― Printed Capture all open tabs or provide a list of the URLs for grabbing

4.62 (2,100)

160,845

#17, ColorZilla

Alex Sirota

Advanced Eyedropper, Color Picker, Gradient Generator and other colorful goodies...

4.05 (402)

146,277

#18, Wappalyzer

Wappalyzer

Identify technologies on websites

4.39 (479)

119,991

#19, Web Developer

chrispederick

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

4.27 (472)

88,884

#20, Windscribe - Free VPN and Ad Blocker

Windscribe

Windscribe helps you circumvent censorship, block ads, beacons and trackers on websites you use every day.

4.53 (3,744)

86,836

#21, Vue.js devtools

Evan You

DevTools extension for debugging Vue.js applications.

4.73 (592)

84,506

#22, Violentmonkey

Gerald

Userscript support for browsers, open source.

4.69 (622)

82,358

#23, Cookie Quick Manager

Ysard

An addon to manage cookies (view, search, create, edit, remove, backup, restore, protect from deletion and much more). Firefox 57+ is supported.

4.39 (361)

62,487

#24, Cookie-Editor

cgagnier

Cookie-Editor lets you efficiently create, edit and delete a cookie for the current tab. Perfect for developing, quickly testing or even manually managing your cookies for your privacy.

4.18 (158)

62,111

#25, User-Agent Switcher

Erin Schlarb

Easily override the browser's User-Agent string

4.40 (477)

61,584