Firefox Extensions

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

Best Firefox Extensions

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Jellyfin

Jellyfin

... Media Server
Jellyfin is a free and open-source media server that allows you to manage and stream your personal media library (movies, TV shows, music, photos) to any device in your home or remotely. It provides a powerful and flexible platform for accessing your content.
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Open Source
Completely free and open source with no hidden costs.
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
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.
more
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.
Karma Blocker

Karma Blocker

Web Browsers Browser Extension
Karma Blocker is a Firefox browser extension designed to help users minimize online distractions and enhance focus while browsing. By selectively blocking elements and websites, it aims to create a more productive and less overwhelming internet experience.
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Open Source
Helps reduce online distractions
NetVideoHunter

NetVideoHunter

Video & Movies Browser Extension
<p>NetVideoHunter is a versatile music and video downloader available primarily as a browser extension for Firefox, Chrome, and Edge. It specializes in capturing media from popular platforms like YouTube, Vimeo, Metacafe, and Facebook, offering a convenient way to save online videos and audio for offline access.</p>
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Open Source
Seamless integration with popular web browsers.
Element Hiding Helper for Adblock Plus

Element Hiding Helper for Adblock Plus

Development Browser Extension
Element Hiding Helper for Adblock Plus is a specialized Firefox extension designed to complement Adblock Plus, enabling users to easily hide specific elements on web pages that are not blocked by standard ad filters. This provides enhanced customization and control over your browsing experience, removing intrusive sections or blank spaces left by blocked ads.
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Open Source
Simplifies hiding of webpage elements.
cliget

cliget

File Sharing Browser Extension
cliget is a Firefox browser extension that simplifies the process of generating command-line download commands (curl and wget) for resources accessed within your browser. This is particularly useful for downloading files that require specific browser cookies or headers, allowing you to seamlessly transfer downloads to remote machines or use advanced download managers.
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Open Source
Generates curl/wget commands that include browser session de...
Random Agent Spoofer

Random Agent Spoofer

Network & Admin Browser Extension
Random Agent Spoofer is a Firefox add-on designed to enhance user privacy by regularly changing browser identifiers. It aims to combat browser fingerprinting techniques used by websites to track users across the web.
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Open Source
Specifically targets browser fingerprinting.
FireSSH

FireSSH

Network & Admin SSH Client
FireSSH is a free and open-source SSH terminal client designed as a browser extension for Waterfox. It provides secure shell access to remote servers directly within your web browser window, eliminating the need for a separate desktop application. With features like tabbed interfaces and host management, it offers a convenient and integrated solution for managing SSH connections.
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Open Source
Integrated within the Waterfox browser for convenience.
Squirt

Squirt

News & Books
Squirt is a browser extension for fast reading.
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Open Source
Lightbeam for Firefox

Lightbeam for Firefox

Security & Privacy
Lightbeam for Firefox is a Firefox add-on that enables you to see the first and third party sites you interact with on the Web.
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Open Source
Save Text To File

Save Text To File

Web Browsers Browser Extension
Save Text To File is a simple yet powerful Firefox add-on designed to streamline the process of saving selected text from web pages directly to a file. It integrates seamlessly into your browser's context menu, providing a quick and efficient alternative to traditional copy-pasting and file creation.
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Open Source
Streamlines saving text from web pages.
Gmail Notifier (restartless)
Gmail Notifier (restartless) is an open-source project that notifies you about incoming emails from all your Google Mail accounts and labels.
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Open Source
Add to Search Bar

Add to Search Bar

Online Services
Add to Search Bar lets you add the search functionality of any page to the search box with no effort.
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Open Source
Mailvelope

Mailvelope

Security & Privacy Browser Extension
Mailvelope is a free and open-source browser extension for Chrome and Firefox that brings end-to-end encryption to your existing webmail services using the OpenPGP standard. It allows users to encrypt, decrypt, and digitally sign emails directly within their web browser, enhancing privacy and security without requiring a change in email provider.
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Open Source
Integrates directly with existing webmail services.
DeeperWeb

DeeperWeb

Online Services Online Service
DeeperWeb is a privacy-focused metasearch engine that enhances Google search results using tag cloud and topic map techniques for improved navigation and discovery. It prioritizes user privacy by not tracking searches.
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Open Source
Unique visual navigation using tag clouds.
Chatzilla

Chatzilla

Social & Communications IRC Client
Multi-platform IRC client tightly integrated with Mozilla browsers, offering a familiar interface for seamless chat experiences.
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Open Source
Seamless integration with Mozilla browsers
FireGestures

FireGestures

OS & Utilities Browser Extension
FireGestures is a powerful and highly customizable Firefox extension that allows users to control their browser with intuitive mouse gestures, significantly enhancing browsing speed and efficiency for legacy Firefox versions.
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Open Source
Significantly speeds up browsing through gestures.
Ubiquity

Ubiquity

Education & Reference Browser Extension
Ubiquity is a powerful Firefox extension that brings the capabilities of a command line interface directly into your web browser. It allows users to perform a wide range of actions on web content and browser functions using natural language commands, significantly increasing productivity and streamlining workflows.
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Open Source
Increases browsing speed and efficiency through command-line...
Lightspark

Lightspark

Video & Movies Flash Player
Lightspark is a free and open-source alternative SWF player designed to play Adobe Flash content. It acts as a runtime environment and browser extension, offering compatibility with Windows and supporting various Flash functionalities.
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Open Source
Free and open-source
PassIFox & ChromeIPass

PassIFox & ChromeIPass

Security & Privacy Browser Extension
PassIFox & ChromeIPass are browser extensions that provide seamless integration with KeePass and KeePassXC password managers. They allow users to store, manage, and automatically fill online credentials directly from their browser, enhancing security and convenience.
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Open Source
Securely integrates KeePass/KeePassXC with web browsers.
LanguageTool

LanguageTool

Web Browsers Web Browser Extension
LanguageTool is an extensive open-source proofreading tool designed for individuals and businesses, supporting a large number of languages. It offers crucial grammar, style, and spell checking capabilities across various platforms through browser extensions, desktop applications, and integrations.
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Open Source
Extensive support for a large number of languages.
Speed Dial

Speed Dial

Web Browsers Browser Extension
Speed Dial is a versatile browser extension designed to replace your default new tab page with a highly customizable visual dashboard, offering quick access to frequently visited sites, bookmarks, and browsing history for enhanced navigation and productivity.
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Open Source
Transforms new tab page into a useful dashboard.
Apertium

Apertium

Education & Reference Machine Translation Software
Apertium is a free, open-source machine translation platform utilizing rule-based methods. It provides versatile translation capabilities, including online translation, browser integration, and potential for localized content.
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Open Source
High translation quality for supported language pairs.
UnMHT

UnMHT

Web Browsers Browser Extension
UnMHT is a essential Firefox and SeaMonkey add-on that provides comprehensive support for reading and writing MHTML (MHT) and MAFF files. It allows users to save complete web pages, including HTML, images, and other embedded content, as a single file for easy offline access and archiving.
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Open Source
Enables saving and reading MHT and MAFF files.
Update Scanner

Update Scanner

News & Books Browser Extension
Update Scanner is a long-standing and reliable Firefox extension designed to monitor web pages for content changes. It's particularly useful for tracking updates on websites that do not offer traditional Atom or RSS feeds, providing a simple and efficient way to stay informed about modifications.
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Open Source
Seamless integration with Firefox
Bluhell Firewall

Bluhell Firewall

Security & Privacy Browser Extension
Bluhell Firewall is a highly efficient and lightweight ad and tracker blocker designed as a browser extension for Firefox and Thunderbird. It prioritizes user privacy and browsing speed with minimal resource usage.
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Open Source
Extremely lightweight with minimal performance impact.
SemanticScuttle

SemanticScuttle

News & Books Web-based application
SemanticScuttle is an open-source, self-hosted social bookmarking system that emphasizes structured tagging and collaborative knowledge management. It allows users to save, organize, and share bookmarks with a strong focus on semantic relationships between tags.
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Open Source
Complete data ownership and control through self-hosting.
Showing 1 - 30 of 59

Recently Added Firefox Extensions

Jellyfin

Jellyfin

... Media Server
Jellyfin is a free and open-source media server that allows you to manage and stream your personal media library (movies, TV shows, music, photos) to any device in your home or remotely. It provides a powerful and flexible platform for accessing your content.
more
Open Source
Completely free and open source with no hidden costs.
OneTab

OneTab

OS & Utilities Browser Extension
OneTab is a browser extension for Chrome, Firefox, and Edge designed to significantly reduce memory usage and declutter your tab bar. By converting multiple open tabs into a single list, it optimizes performance and improves browsing organization.
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Free
Significantly reduces browser memory usage.
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.
more
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.
more
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.
more
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.
more
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