Firefox Extensions

Discover Firefox Extensions by functionality or find alternatives for your favorite Firefox Extensions

Best Firefox Extensions

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Wappalyzer

Wappalyzer

Development
Wappalyzer is a cross-platform utility that uncovers the technologies used on websites.
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Open Source
FlashGot

FlashGot

File Sharing Browser Extension
FlashGot is a powerful, free, and open-source browser extension for Mozilla Firefox designed to improve download management. It integrates seamlessly with various external download managers, allowing users to handle single and massive downloads more efficiently and effectively than the browser's native functionality.
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Open Source
Seamless integration with Firefox for improved download hand...
Riot.im

Riot.im

Office & Productivity Team Collaboration
Riot.im, now known as Element, is a secure, privacy-focused collaboration platform built on the open Matrix protocol. It enables real-time communication through chat, voice, and video calls, offering end-to-end encryption and bridging capabilities to connect with users on other networks like Slack, GitHub, and more.
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Open Source
Strong end-to-end encryption for privacy.
Adblock Edge

Adblock Edge

Web Browsers Browser Extension
Adblock Edge was a browser extension designed to block advertisements within web pages. Primarily focused on Microsoft Edge (formerly Project Spartan), it aimed to provide users with a cleaner, faster browsing experience by preventing the loading of various ad formats.
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Open Source
Blocks various ad formats effectively.
µMatrix

µMatrix

Security & Privacy Browser Extension
uMatrix is a browser extension that functions as a powerful point-and-click matrix-based firewall and privacy-enhancement tool. It provides granular control over what resources are loaded by your browser, allowing users to block or allow requests based on type, origin, and destination, helping to protect privacy and improve browsing security.
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Open Source
Provides granular control over network requests via a visual...
ScrapBook

ScrapBook

Development Browser Extension
ScrapBook is a Firefox extension for enhanced web content management. It allows users to save full web pages, manage bookmarks, take notes, annotate, and organize digital content offline, serving as a comprehensive digital scrapbooking tool.
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Open Source
Saves complete web pages for reliable offline access.
SQLite Manager

SQLite Manager

Office & Productivity
SQLiteManager is a powerful database management system for sqlite databases, it combines an easy to use interface with blazing speed operations.
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Open Source
Youtube Video and Audio Downloader

Youtube Video and Audio Downloader

Audio & Music Browser Extension
A feature-rich browser extension for Firefox that allows users to effortlessly download YouTube videos and convert them to various audio and video formats, including MP3 and MP4. It's an open-source solution designed for simplicity and efficiency in media acquisition.
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Open Source
Seamless integration with Firefox browser.
Disconnect

Disconnect

Security & Privacy Browser Extension
Disconnect is a robust tool designed to enhance online privacy by visualizing and blocking the invisible tracking technologies that follow your browsing and search history across the web. Available as a browser extension and other privacy-focused solutions, it aims to significantly reduce the amount of personal data collected by third-party trackers.
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Open Source
Effectively blocks online trackers.
FireFTP

FireFTP

File Management FTP Client
FireFTP was a free, open-source, cross-platform FTP client deeply integrated into the Mozilla Firefox browser as an add-on. It provided a familiar two-pane interface for easy file transfers between local and remote servers, supporting both FTP and SFTP protocols.
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Open Source
Integrated directly into Firefox for convenience.
Terms of Service Didn't Read

Terms of Service Didn't Read

Security & Privacy Browser Extension
Terms of Service Didn't Read (ToS;DR) is a community-driven project that helps users understand the terms of service and privacy policies of online services and websites. It provides summaries and ratings, highlighting important clauses that users might otherwise miss.
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Open Source
Simplifies complex legal documents into understandable summa...
Privacy Badger

Privacy Badger

Security & Privacy Browser Extension
Privacy Badger is a free browser extension developed by the Electronic Frontier Foundation (EFF) that automatically learns to block invisible trackers.
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Open Source
Effectively blocks invisible trackers using a unique heurist...
Firefox PDF Viewer (PDF.js)

Firefox PDF Viewer (PDF.js)

Office & Productivity Browser Extension
Firefox PDF Viewer (PDF.js) is an open-source, web standards-based PDF viewer embedded directly within the Firefox browser. It allows users to view PDF documents seamlessly without the need for external software or plugins, enhancing browser-based document handling and accessibility.
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Open Source
Seamlessly integrated into Firefox
Mozilla Archive Format

Mozilla Archive Format

Web Browsers Web Browser Extension
The Mozilla Archive Format (MAFF) is a legacy Firefox extension that allows users to save complete web pages, including all embedded resources like images, CSS, and JavaScript, into a single archive file for offline viewing.
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Open Source
Saves complete web pages including all resources for accurat...
Firefox Sync

Firefox Sync

Web Browsers Browser Feature
Firefox Sync seamlessly synchronizes your browsing data across all your devices running Firefox. Access tabs, bookmarks, history, passwords, and preferences from your desktop, laptop, or mobile phone, ensuring a consistent and personalized browsing experience wherever you go.
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Open Source
Seamless synchronization of core browsing data.
uBlock

uBlock

Security & Privacy Browser Extension
uBlock is a powerful, yet lightweight, content blocker available as a browser extension for various platforms. It effectively blocks ads, trackers, and malware sites, enhancing privacy and improving browsing speed. Although currently discontinued, its effectiveness and open-source nature made it a popular choice for users seeking a cleaner web experience.
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Open Source
Highly effective at blocking ads and trackers.
Zotero

Zotero

Backup & Sync Research
Zotero is a free and open-source reference management software that helps users collect, organize, cite, and share their research sources. It integrates seamlessly with web browsers and word processors to streamline the research and writing process.
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Open Source
Free and open-source
NoScript

NoScript

Development Browser Extension
NoScript is a powerful browser extension for Firefox and other browsers that provides essential security by blocking JavaScript, Java, Flash, Silverlight, and other potentially malicious active content on websites unless explicitly allowed.
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Open Source
Significantly enhances browsing security by blocking malicio...
Pencil Project

Pencil Project

Photos & Graphics Desktop
Pencil Project is a free and open-source GUI prototyping tool that helps designers and developers create wireframes and mockups easily. Available as a standalone application and a Firefox extension, it offers a wide range of built-in shapes and templates for various platforms.
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Open Source
Free and open source with no cost.
WebTorrent

WebTorrent

File Sharing Desktop Application
WebTorrent is a revolutionary torrent client offering streaming playback directly in the browser or via dedicated desktop applications built with Electron. It leverages the power of WebRTC for peer-to-peer file sharing and data streaming, enabling efficient and immediate content consumption.
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Open Source
Stream media while downloading
RequestPolicy

RequestPolicy

Security & Privacy Browser Security Enhancement
RequestPolicy is a powerful, open-source browser extension for Firefox that provides granular control over cross-site requests. It helps protect users from various web vulnerabilities like Cross-Site Scripting (XSS), Cross-Site Request Forgery (CSRF), and Clickjacking by allowing you to explicitly approve or deny requests to external domains.
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Open Source
Strong default-deny security model for cross-site requests.
Greasemonkey

Greasemonkey

Development Browser Extension
Greasemonkey is a highly influential and versatile Firefox extension that empowers users to personalize and enhance their web browsing experience by installing custom scripts. These scripts can modify web page content, alter layouts, add new functionalities, and automate tasks, effectively customizing how users interact with websites.
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Open Source
Enables deep customization of web pages.
Keefox

Keefox

Security & Privacy Browser Extension
KeeFox is a powerful Firefox extension that integrates seamlessly with KeePass, a free and open-source password manager. It provides secure storage and automatic filling of login details, enhancing both convenience and security for your online accounts within the Firefox browser.
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Open Source
Seamless integration with KeePass
Prism

Prism

Web Browsers
Prism is a simple XULRunner based browser that hosts web applications without the normal web browser user interface.
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Open Source
Firebug

Firebug

Development Browser Extension
Firebug was a powerful, open-source web development tool tightly integrated with the Firefox web browser. It provided a comprehensive environment for debugging, editing, and monitoring HTML, CSS, and JavaScript live on any web page.
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Open Source
Deeply integrated within the Firefox browser
DownThemAll

DownThemAll

File Sharing Browser Extension
DownThemAll! is a powerful browser extension designed to streamline and accelerate your file downloads. Integrating seamlessly with your web browser, it offers advanced features like multiparty downloads, pauses and resumes, and customizable filtering to manage your downloads efficiently and significantly improve download speed.
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Open Source
Significantly accelerates downloads using multipart technolo...
uBlock Origin

uBlock Origin

Security & Privacy Browser Extension
uBlock Origin is a highly efficient, wide-spectrum blocker for browsers. It goes beyond simple ad blocking by tackling trackers, malware sites, and cosmetic annoyances, all while maintaining a light footprint on your browser's resources.
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Open Source
Highly effective at blocking ads, trackers, and malware site...
Disconnect Search

Disconnect Search

Online Services Browser Extension
Disconnect Search is a privacy-focused search engine and browser extension that prevents major search engines from tracking your searches and location. It routes your searches anonymously through Disconnect's servers, protecting your privacy while allowing you to utilize popular search providers like Google, Bing, and DuckDuckGo.
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Open Source
Effectively anonymizes search queries with major engines.
Adblock Plus

Adblock Plus

Web Browsers Browser Extension
Adblock Plus is a widely used browser extension that effectively blocks intrusive ads, pop-ups, and tracking scripts across various websites, providing a cleaner and faster browsing experience.
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Open Source
Effective at blocking most ads and pop-ups
Showing 31 - 59 of 59

Recently Added Firefox Extensions

Jellyfin

Jellyfin

...
Jellyfin is an Open Source media solution to stream to any device from your own server.
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Open Source
OneTab

OneTab

OS & Utilities
OneTab is a google chrome extension to save memory usage while browsing the internet.
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Free
Microsoft Silverlight

Microsoft Silverlight

Development
Silverlight is a powerful development tool for creating engaging, interactive user experiences for Web and mobile applications.
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Free
FileCloud

FileCloud

...
FileCloud is a file sharing, backup, and remote management solution.
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Commercial
Mozilla Add-ons

Mozilla Add-ons

Web Browsers Web Browser Add-on Repository
Mozilla Add-ons is the official repository for extensions and themes to customize and enhance the Firefox web browser. It offers a vast and diverse collection to personalize your browsing experience.
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Open Source
Vast selection of extensions and themes
Wayback Machine

Wayback Machine

Online Services Online Service
The Wayback Machine, part of the Internet Archive, is a digital archive of the World Wide Web and other information on the Internet. It allows users to visit archived versions of web pages they may have missed, including those that have been changed or removed.
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Free
Extensive archive of historical web pages.
ActivityWatch

ActivityWatch

Office & Productivity Desktop Application
ActivityWatch is a free and open-source, privacy-focused time-tracking application that automatically monitors how you spend time on your devices, offering detailed insights into your digital activities with local storage and offline functionality.
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Open Source
Strong emphasis on user privacy with local data storage.
Joplin

Joplin

... Note Taking
Joplin is a free and open-source note-taking and to-do application designed for users who value data ownership, privacy, and flexibility. It offers robust synchronization options, including cloud services like Dropbox, OneDrive, and Nextcloud, as well as WebDAV. With support for Markdown, powerful search capabilities, and cross-platform availability, Joplin is a versatile tool for organizing information and boosting productivity.
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Open Source
Free and open-source with strong community support.
ZenMate

ZenMate

Security & Privacy Browser Extension
ZenMate VPN for Chrome is a browser extension designed to enhance online security, privacy, and freedom. It encrypts your internet traffic, hides your IP address, and allows access to geo-restricted content with ease.
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Commercial
Easy to install and use within Chrome.
Download Status Bar

Download Status Bar

File Sharing
Download Status Bar manages every aspect of your download.
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Free