Firefox Nightly for Developers

4.3
65.1K reviews
1M+
Downloads
Content rating
Everyone
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About this app

Warning: Nightly is an unstable testing and development platform. By default, Firefox Nightly automatically sends data to Mozilla — and sometimes our partners — to help us handle problems and try ideas. Learn what is shared: https://www.mozilla.org/en-US/privacy/firefox/#pre-release

Firefox Nightly gets updated every day and is designed to showcase the more experimental builds of Firefox. The Nightly channel allows users to experience the newest Firefox innovations in an unstable environment and provide feedback on features and performance to help determine what makes 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/

BILLIONAIRE FREE FOR 20+ YEARS
The Firefox browser was created in 2004 by Mozilla as a faster, more private browser with more customizable features than web browsers like Internet Explorer. Today, we are still not-for-profit, still not owned by any billionaires and still working to make the internet — and the time you spend on it — better. To learn more about Mozilla, please go to https://www.mozilla.org.

LEARN 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 wild side. Be among the first to explore future releases.
Updated on
Apr 22, 2026

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
No data shared with third parties
Learn more about how developers declare sharing
This app may collect these data types
Location, Personal info and 3 others
Data is encrypted in transit
You can request that data be deleted

Ratings and reviews

4.3
60.3K reviews
Jordan Anderson
June 21, 2025
I'm not entirely sure what happened with the design of the browser since the last update I had installed, but moving all the settings to a full-screen pop-up was not the right move. I used the quick-access navigation buttons often, and the small desktop-like pop-up for settings and extensions and the like from the corner were great. This feels like Mozilla are regressing in design. I chose Firefox because it's simple, customizable, and respects me as a consumer. I now question that choice.
64 people found this review helpful
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Arin
March 31, 2026
I'm sure others are having issues since the last update, but still felt like sharing. 1. the search bar duplicates swiped and autocorrected words and abbreviations. 2. It frequently goes back a page, and removed the "forward" button in the menu, like you were never on another page. 3. some of my pages are simply missing. 4. I really do not like the 2 options available for the menu, search bar, and quick link bar.. what wrong with the wheel before you reinvented it?
3 people found this review helpful
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Eric Long
April 14, 2026
One thing they nailed is making the AI optional. I love that. that's all I could ask is "always having a choice". I wish that extended to the ability to remove the Google Chrome style rounded everything that the new era of Firefox has adopted, but I'm optimistic it will eventually be an option to have everything squared off again to make better use of the limited space I have on my phone. I'm optimistic as there are options like moving address bar to bottom for longer phones like mine. Thank you
2 people found this review helpful
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