Top Firefox OS Alternatives for Your Mobile and Smart Devices
Firefox OS, an open-source operating system designed by Mozilla and its community, aimed to provide a complete, web-application-centric alternative for smartphones, tablets, and smart TVs. Based on the Firefox web browser's rendering engine and the Linux kernel, it championed open standards like JavaScript and HTML5. However, with its discontinuation, many users are now seeking robust and reliable Firefox OS alternatives. Fortunately, several excellent options have emerged to fill this void, offering diverse features and platforms for various needs.
Best Firefox OS Alternatives
Whether you're looking for a mobile OS that prioritizes open source, offers extensive app ecosystems, or provides unique desktop-like experiences on mobile, there's an alternative out there for you. Here are some of the leading contenders:

Android
Android is a widely adopted operating system for mobile devices, offering a vast ecosystem of applications and a highly customizable experience. As a Free and Open Source platform based on the Linux kernel, it aligns well with the spirit of Firefox OS, providing a powerful and versatile mobile OS with features like ARM support, Google integration, and optimization for fastboot mode.

Remix OS
Remix OS is an Android-based operating system that offers a desktop-like experience on mobile and desktop devices, making it a unique Firefox OS alternative. This Free Linux and Android-compatible platform stands out with features like an integrated Android Emulator, booting from USB, and floating windows, providing a bridge between mobile and traditional computing environments.

Plasma Mobile
Plasma Mobile transforms your phone into a fully open hacking device, much like a PC. As a Free and Open Source Linux-based mobile OS, it offers a truly libre experience, echoing the open spirit of Firefox OS and providing a portable Linux environment for those who desire deep customization and control over their mobile device.

Sailfish OS
Sailfish OS is a mobile-optimized operating system that combines the flexibility and stability of a Linux core with a modern user experience built on the Qt™ platform. As a Free and Self-Hosted solution, it provides a minimalistic and robust mobile OS, making it a compelling Firefox OS alternative for users seeking a stable and efficient mobile environment.

iOS
iOS, developed by Apple Inc., is a well-known mobile operating system exclusive to Apple hardware. While not open-source, it offers a highly polished user experience with a strong focus on privacy and security. As a Free platform for iPhone, iPad, and Apple Watch, iOS provides a comprehensive mobile OS with features like integrated web browser, mobile apps, and OTA updates, serving as a premium alternative to Firefox OS.

Tizen OS
Tizen is an open-source mobile and device operating system based on Linux, developed by Samsung and Intel. Much like Firefox OS, it's designed to support a wide range of devices. This Free and Open Source platform is a lightweight, Linux-based mobile OS offering multitouch and multitasking capabilities, making it a strong contender for those seeking an open and versatile alternative.

Astian OS
Astian OS is an operating system with roots in the discontinued Firefox OS, developed by Astian Foundation. This Free, Open Source, and Self-Hosted platform provides continued support for mobile devices and TVs, embodying the spirit of its predecessor. It boasts features like configurability, Linux-based architecture, and scalability, making it a direct spiritual successor and excellent Firefox OS alternative.

B2G OS
B2G OS is a community-maintained open-source operating system for smartphones, tablets, smart TVs, and other connected devices. Originally based on the Firefox OS project, this Free, Open Source, and Self-Hosted platform continues to offer a robust mobile OS, preserving the core ideals of its origin and providing a strong, community-driven Firefox OS alternative.

QtMoko
QtMoko is a Debian distribution specifically designed for Linux-based smartphones like the Openmoko Freerunner. As a Free, Open Source, Linux, and Self-Hosted platform, it provides a mobile OS experience based on Debian and QT Extended, making it an excellent Firefox OS alternative for those who appreciate deep Linux integration and open-source principles on their mobile devices.
With a diverse range of operating systems now available, you can find a Firefox OS alternative that perfectly suits your preferences for openness, app availability, user experience, and hardware compatibility. Explore these options to discover the best fit for your mobile and smart device needs.