Cost / License
- Free
- Open Source
Platforms
- Mac
- Windows
- Linux
- Notion
- Microsoft Edge
- Google Chrome
- Firefox
United States




Browse 2,000 Mozilla Firefox Plugins, Add-ons and extension on AlternativeTo including popular Mozilla Firefox options.




Creating visual content should be simple, fun and lightweight. Stencil is designed to help you create beautiful looking images faster than ever before. Even if you've never used an image editing program, you can pick Stencil up and use it in seconds.




PageSpeed Insights (PSI) reports on the performance of a page on both mobile and desktop devices, and provides suggestions on how that page may be improved.

A open source manifest v3 web extension with minimal permissions that automatically redirects popular sites to privacy friendly frontends and backends

Say hello to Lilo - the search engine which funds life changing projects of your choice for free.



Develop responsive web apps 5x faster! A must-have DevTool for all Front-End developers that will make your job easier.

Gopeed (full name Go Speed), a high-speed downloader developed by Golang + Flutter, supports (HTTP, BitTorrent, Magnet) protocol, and supports all platforms. In addition to basic download functions, Gopeed is also a highly customizable downloader that supports implementing more...



Ona is an open-source developer platform automating the provisioning of ready-to-code development environments.



Comprehensive tool for refining writing with grammar checking, stylistic suggestions, and 25 reports. Enhances clarity, style, and error-free content.




Be incredibly focused and productive. Join millions of amazing people who use Freedom to manage their screen time and live happier, healthier, and more productive lives.




Organizes browser tabs into smart workspaces for projects, meetings, and workflows to reduce clutter, improve focus, and simplify context switching.

CNET Shopping helps you get the best prices on your favorite products. Get promo codes and discounts with a single click.




Watch2Gether is a service that allows you to watch videos from Youtube, Netflix, Vimeo and other platforms in-sync together with your friends.



Minimalist and lightweight startpage inspired by iOS, Bonjourr is a fully open source and privacy focused new tab page that offers loads of customization.




The Web Developer extension adds various web developer tools to a browser. The extension is available for Chrome, Edge, Firefox, and Opera, and will run on any platform that these browsers support including Windows, macOS and Linux.




Securely manage and autofill your passwords across devices with zero-knowledge encryption and two-factor authentication. Also available standalone.



Power Thesaurus is a fast, comprehensive and easy-to-follow online thesaurus for writers, journalists, students and teachers.


Gecko is the name of the layout engine developed by the Mozilla Project. Gecko's function is to render web content, such as HTML, CSS, XUL, JavaScript, and render it on the user's screen or print it.
This extension helps you control more of your web activity from Facebook by isolating your identity into a separate container.

Secure and private internet access with end-to-end encryption, high-speed browsing, unlimited devices, multi-hop routing, kill switch, and global server coverage.



WebAssembly or wasm is a new portable, size- and load-time-efficient format suitable for compilation to the web.
Flagfox is a Firefox extension that displays a flag depicting the location of the current website's server and provides a multitude of tools such as site safety checks, WhoIs, similar sites, and more.




Subscribe, download, and organize YouTube videos in a searchable library with playback, viewing history tracking, batch downloads, and channel management features.




Progressive Web Apps (PWAs) are web apps that use web APIs and features along with progressive enhancement strategy to bring a native app-like user experience to cross-platform web applications. Although Firefox supports many of Progressive Web App APIs, it does not support...



