Best Firefox Apps and Services

Handpicked collection of the most popular and highly-rated Firefox applications

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Gnash

Gnash

Open Source

Gnash is a free and open-source software player for SWF files, a format primarily used for Adobe Flash media. Developed as part of the GNU Project, it aimed to provide an independent and secure alternative to Adobe Flash Player, supporting various Flash functionalities for animation, video, and interactive web content, particularly during the widespread use of Flash on the internet.

Free and open-source software
Embeddable
Video & Movies
Floccus

Floccus

Open Source

Floccus is an open-source, cross-browser bookmark synchronization extension that prioritizes user privacy and data control. It allows users to sync their bookmarks across various web browsers, offering strong encryption and the flexibility of self-hosting, ensuring that your valuable bookmark data remains private and secure. Ideal for individuals and teams seeking an alternative to cloud-based, vendor-locked sync solutions.

Superior data privacy with end-to-end encryption.
Bookmarks
Web Browsers
Metastream

Metastream

Open Source

Metastream is a unique collaborative browsing platform that specializes in synchronized video streaming. It allows users to watch videos and browse the web together in real-time, fostering a shared experience. With integrated chat, private group options, and support for major streaming platforms, Metastream transforms passive viewing into an interactive social event, all without requiring any complex registration.

Flawless real-time content synchronization across all participants.
Google Chrome Extensions
Social & Communications Video & Movies Web Browsers
Jellyfin

Jellyfin

Open Source

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.

Completely free and open source with no hidden costs.
Ad-free
... Audio & Music Video & Movies
Mozilla Add-ons

Mozilla Add-ons

Open Source

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.

Vast selection of extensions and themes
Add-ons
Web Browsers
ActivityWatch

ActivityWatch

Open Source

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.

Strong emphasis on user privacy with local data storage.
Ability to add more watchers
Office & Productivity Security & Privacy Sport & Health Web Browsers
Joplin

Joplin

Open Source

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.

Free and open-source with strong community support.
Ad-free
... Backup & Sync Business & Commerce File Management Office & Productivity Security & Privacy Web Browsers
Karma Blocker

Karma Blocker

Open Source

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.

Helps reduce online distractions
Firefox extension
Web Browsers
NetVideoHunter

NetVideoHunter

Open Source

<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>

Seamless integration with popular web browsers.
Built-in player
Video & Movies Web Browsers
Element Hiding Helper for Adblock Plus

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.

Simplifies hiding of webpage elements.
Firefox extension
Development Web Browsers
cliget

cliget

Open Source

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.

Generates curl/wget commands that include browser session details.
Firefox extension
File Sharing Web Browsers
Random Agent Spoofer

Random Agent Spoofer

Open Source

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.

Specifically targets browser fingerprinting.
Firefox extension
Network & Admin Web Browsers
FireSSH

FireSSH

Open Source

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.

Integrated within the Waterfox browser for convenience.
Browser based app
Network & Admin OS & Utilities
Squirt

Squirt

Open Source

Squirt is a browser extension designed to significantly increase your reading speed. By displaying text one word at a time using RSVP technology, it eliminates distractions and allows you to consume online content faster and more efficiently. Perfect for researchers, students, or anyone looking to save time when reading articles, blogs, or documents online.

Significantly increases reading speed.
Clipboard monitoring
News & Books Office & Productivity
Lightbeam for Firefox

Lightbeam for Firefox

Open Source

Lightbeam for Firefox is a powerful Firefox add-on that visually demonstrates your interactions with first- and third-party sites across the web, highlighting potential tracking connections.

Provides clear, real-time visualization of tracking networks.
Firefox extension
Security & Privacy Web Browsers
PageSpeed Insights

PageSpeed Insights

Open Source

PageSpeed Insights is a free online tool provided by Google that analyzes the speed performance of web pages on both mobile and desktop devices. It provides detailed reports on how well a page is performing and suggests actionable recommendations to improve its loading speed and overall user experience.

Free and easy to use
Test HTTP Performance
Development
Save Text To File

Save Text To File

Open Source

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.

Streamlines saving text from web pages.
Firefox extension
Web Browsers
Gmail Notifier (restartless)

Gmail Notifier (restartless) is a seamless browser extension for Chrome and Firefox, providing real-time notifications for new emails across all your connected Google Mail accounts and labels. Stay updated without constantly checking your inbox, streamlining your email management.

Supports multiple Gmail accounts.
Google Chrome extension
Web Browsers
Add to Search Bar

Add to Search Bar

Open Source

Add to Search Bar is a Firefox extension that simplifies the process of adding custom search engines directly to your browser's search bar, allowing for quick access to search functionalities from various websites.

Easily adds site-specific search engines to Firefox.
Firefox extension
Online Services Web Browsers
Mailvelope

Mailvelope

Open Source

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.

Integrates directly with existing webmail services.
Google Chrome extension
Security & Privacy Web Browsers
DeeperWeb

DeeperWeb

Open Source

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.

Unique visual navigation using tag clouds.
Search engine
Online Services
Chatzilla

Chatzilla

Open Source

Multi-platform IRC client tightly integrated with Mozilla browsers, offering a familiar interface for seamless chat experiences.

Seamless integration with Mozilla browsers
Chat
Social & Communications
FireGestures

FireGestures

Open Source

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.

Significantly speeds up browsing through gestures.
Firefox extension
OS & Utilities Web Browsers
Ubiquity

Ubiquity

Open Source

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.

Increases browsing speed and efficiency through command-line interface.
Firefox extension
Education & Reference Web Browsers
Lightspark

Lightspark

Open Source

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.

Free and open-source
Built-in Adobe Flash Player
Video & Movies
PassIFox & ChromeIPass

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.

Securely integrates KeePass/KeePassXC with web browsers.
Google Chrome extension
Security & Privacy Web Browsers
LanguageTool

LanguageTool

Open Source

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.

Extensive support for a large number of languages.
Google Chrome extension
Web Browsers
Speed Dial

Speed Dial

Open Source

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.

Transforms new tab page into a useful dashboard.
Firefox extension
Web Browsers
Apertium

Apertium

Open Source

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.

High translation quality for supported language pairs.
Online translation
Education & Reference Web Browsers
UnMHT

UnMHT

Open Source

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.

Enables saving and reading MHT and MAFF files.
Firefox extension
Web Browsers
Showing 30 of results

Recently Added Firefox Apps and Services

Latest additions to our Firefox software collection

Gnash

Gnash

Open Source

Gnash is a free and open-source software player for SWF files, a format primarily used for Adobe Flash media. Developed as part of the GNU Project, it aimed to provide an independent and secure alternative to Adobe Flash Player, supporting various Flash functionalities for animation, video, and interactive web content, particularly during the widespread use of Flash on the internet.

Free and open-source software
Embeddable
Video & Movies
Floccus

Floccus

Open Source

Floccus is an open-source, cross-browser bookmark synchronization extension that prioritizes user privacy and data control. It allows users to sync their bookmarks across various web browsers, offering strong encryption and the flexibility of self-hosting, ensuring that your valuable bookmark data remains private and secure. Ideal for individuals and teams seeking an alternative to cloud-based, vendor-locked sync solutions.

Superior data privacy with end-to-end encryption.
Bookmarks
Web Browsers
Metastream

Metastream

Open Source

Metastream is a unique collaborative browsing platform that specializes in synchronized video streaming. It allows users to watch videos and browse the web together in real-time, fostering a shared experience. With integrated chat, private group options, and support for major streaming platforms, Metastream transforms passive viewing into an interactive social event, all without requiring any complex registration.

Flawless real-time content synchronization across all participants.
Google Chrome Extensions
Social & Communications Video & Movies Web Browsers
Jellyfin

Jellyfin

Open Source

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.

Completely free and open source with no hidden costs.
Ad-free
... Audio & Music Video & Movies
Mozilla Add-ons

Mozilla Add-ons

Open Source

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.

Vast selection of extensions and themes
Add-ons
Web Browsers
ActivityWatch

ActivityWatch

Open Source

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.

Strong emphasis on user privacy with local data storage.
Ability to add more watchers
Office & Productivity Security & Privacy Sport & Health Web Browsers
Joplin

Joplin

Open Source

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.

Free and open-source with strong community support.
Ad-free
... Backup & Sync Business & Commerce File Management Office & Productivity Security & Privacy Web Browsers
Karma Blocker

Karma Blocker

Open Source

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.

Helps reduce online distractions
Firefox extension
Web Browsers
NetVideoHunter

NetVideoHunter

Open Source

<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>

Seamless integration with popular web browsers.
Built-in player
Video & Movies Web Browsers
Element Hiding Helper for Adblock Plus

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.

Simplifies hiding of webpage elements.
Firefox extension
Development Web Browsers