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.
APK Information
- Version
- 159.0a1
- Size
- 222.6 MB
- Android
- 10.0+
- File type
- APK
- Updated
- Oct 8, 2026
- Package
- org.mozilla.fenix
- Developer
- Mozilla
Features
Nightly preview build
Productivity browser
Mozilla preview channel
Frequently Asked Questions
Which Android versions can run this build?
Compatibility follows the minimum stated in this listing: devices running that Android level or newer are supported, while anything older cannot install the package. Check your handset's system settings to confirm its Android version before downloading.
How much free space should my device have?
The installer is 222.6 MB, so that much space must be available before installation begins. Browsers also accumulate history, cache and saved page data afterwards, so it is sensible to keep noticeably more than 222.6 MB free to avoid running short later.
Is this the stable version of Firefox?
No. Firefox Nightly is Mozilla's preview build, listed under the package name org.mozilla.fenix. It is published so people can see features before they are finalised, which means behaviour and appearance may change from one build to the next.
What date does the current build on this listing carry?
The latest build recorded here is dated 2026-10-08. Because it is a nightly channel, builds are expected to be refreshed regularly, so this date identifies the specific package described on this page.
Does the listing give a content rating for the app?
No, the content rating is not stated, so this page offers no age classification to guide families. Anyone deciding whether the app suits a younger user should reach their own conclusion on that basis.
