Firefox Preview

39.1MB v142.0a1 Update Date：2025-12-14 Developer：Mozilla

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Firefox Preview AI Editor's Review

Firefox Preview (Nightly) offers bleeding-edge features for Android, focusing on speed and privacy. It's a developer and tester-oriented browser that showcases upcoming Firefox innovations. Expect instability but enjoy a glimpse into the future of mobile browsing.

Comprehensive Analysis

Firefox Preview (Nightly) is designed for testing and development, providing early access to experimental features before they reach the stable Firefox release. Users can experience the latest performance improvements and privacy enhancements. However, being a Nightly build, instability is common, and users should expect occasional crashes and bugs. It's best suited for developers and tech enthusiasts willing to tolerate imperfections for a sneak peek at future Firefox functionality.

Key Advantages

Cutting-edge features and experiments
Enhanced privacy protection
Fast browsing speeds

Areas for Improvement

Unstable and prone to crashes
May lack user-friendly interface polish

The Description of Firefox Preview

Site Editorial Commentary：Nightly is built for testers. Help us make Firefox the best browser it can be.

Warning: Firefox Preview (Nightly) is an unstable testing and development platform. It's designed for developers and early adopters. By default, Firefox Preview automatically sends data to Mozilla — and sometimes our partners — to help us handle problems and test new ideas. Learn more about what data is shared: https://www.mozilla.org/en-US/privacy/firefox/#pre-release

Firefox Preview (Nightly) is updated daily and showcases the most experimental builds of Firefox. This channel allows users to experience the newest Firefox innovations in an unstable environment. Provide valuable feedback on features and performance to help shape the final release.

Found a bug? Report it at: https://bugzilla.mozilla.org/enter_bug.cgi?product=Fenix

Want to know more about the permissions Firefox requests?: https://mzl.la/Permissions

See our list of supported devices and latest minimum system requirements at: https://www.mozilla.org/firefox/mobile/platforms/

INDEPENDENT & USER-FOCUSED FOR OVER 20 YEARS
The Firefox browser was created in 2004 by Mozilla as a faster, more private browser with more customizable features than browsers like Internet Explorer. As a non-profit, Mozilla remains independent and dedicated to improving the internet experience for everyone. To learn more about Mozilla, please visit https://www.mozilla.org.

EXPLORE MORE
- Terms of Use: https://www.mozilla.org/about/legal/terms/firefox/
- Privacy Notice: https://www.mozilla.org/privacy/firefox
- Latest news: https://blog.mozilla.org

Take a browse on the cutting edge. Be among the first to explore future releases with Firefox Preview (Nightly).