Version Information
- Version
- 159.0a1
- Release date
- Oct 8, 2026
- Size
- 222.6 MB
- Android
- 10.0+
- File type
- APK
- Package
- org.mozilla.fenix
- Developer
- Mozilla
About Firefox Nightly
Firefox Nightly is Mozilla's experimental preview edition of its browser, delivered under the package name org.mozilla.fenix. It sits in the productivity category and gives early adopters a first look at browsing work while it is still being shaped. The most recent build listed here is dated 2026-10-08. Who Nightly Is For This edition is aimed at people who like to test software ahead of its settled form: enthusiasts, reviewers and anyone following browser development closely. Because it is filed under productivity, the emphasis is on day-to-day browsing work rather than a single specialised task. Casual users who want a quiet, unchanging experience may prefer a standard release instead. Device And Storage Fit The build requires Android 10.0+ or newer devices, so handsets running an older system will not be able to install it. The installer itself occupies 222.6 MB, which is a sizeable download, so confirm that your device has plenty of spare room before you begin and expect the profile to grow further once browsing data accumulates. How A Preview Channel Behaves A nightly channel is where code lands before it is hardened for wider release. Concretely, that means new capabilities can arrive often and details can shift between builds, so anything you see here may look different later. Treating the app as a work in progress keeps expectations realistic. Listing Details Worth Knowing The listing does not supply a content rating, so there is no age guidance to rely on and families should judge for themselves. The file type is also unrecorded, and the app is identified solely by its package name, which matters if you intend to keep it alongside another browser build.