Download Firefox Nightly for Developers

155.0a1

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Old versions

The architecture must match your device's CPU.

How to install

On Android

Updated Jul 27, 2026

Mozilla

4.301M+ installs

Install an APKS installer app from the Play Store.
Open the installer app.
Tap Install and select Firefox-Nightly-for-Developers_155.0a1_apkcube.apk.
Tap OK and wait for the installation to complete.

On Windows

Download and install an Android emulator on your PC.
Open the emulator and sign in.
Drag Firefox-Nightly-for-Developers_155.0a1_apkcube.apk into the emulator window.
Wait for the install to finish, then launch the app.

Before you install: Android will ask you to allow installs from unknown sources, Play Protect may show a warning even on clean files, and sideloaded apps won’t update automatically. XAPK and APKS bundles also need a dedicated installer app. Sideloading guide →

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How to install

On Android

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