Firefox Preview Nightly for Developers
vNightly 200706 06:01 · 82.1 MB · code 21880609
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File information
UpdatedApr 23, 2025
PublishedApr 23, 2025
Packageorg.mozilla.fenix.nightly
VersionvNightly 200706 06:01 (21880609)
Size82.1 MB
MD52190dfda4a0356ff0e7913a17acd332b
Min SDK21
ABIsarm64-v8a
Malware scanTRUSTED
Signature SHA12A:D2:D7:C0:80:BB:08:97:6B:46:D2:BB:50:5A:74:F1:FE:C9:5D:B5
SignerCN=Release Engineering, OU=Release Engineering, O=Mozilla Corporation, L=Mountain View, ST=California, C=US
Total downloads50,000
This version50,000
DeveloperMozilla
Age ratingEveryone
Security scan
TRUSTED
- Developer signature verified 2025-04-23
- Signature SHA1 2A:D2:D7:C0:80:BB:08:97:6B:46:D2:BB:50:5A:74:F1:FE:C9:5D:B5
- File MD5 2190dfda4a0356ff0e7913a17acd332b
How to install Firefox Preview Nightly for Developers vNightly 200706 06:01 on Android 5.0 Lollipop+
Takes about 2 minutes. You'll need roughly 82.1 MB of free storage.
- Grab org.mozilla.fenix.nightly_21880609.apk — hit the Download button above (82.1 MB). If your browser warns about APK files, choose Keep or Download anyway — that warning fires on every APK, not just this one.
- Trust your browser to install — on Android 8+ go to Settings → Apps → Special access → Install unknown apps, pick the app you downloaded with (Chrome, Firefox, Files, etc.), and flip Allow from this source. On older Android, toggle Unknown sources under Security.
- (Optional) Verify the file — compute the MD5 of the downloaded APK and make sure it matches 2190dfda4a0356ff…. Any difference means the file is corrupted or tampered — delete and re-download.
- Open the APK — tap the download notification, or find org.mozilla.fenix.nightly_21880609.apk in your Files app under Downloads, then tap it. Android's package installer will appear.
- Check the signer — the install screen will name the publisher. For this build it should read CN=Release Engineering, OU=Release Engineering, O=Mozilla Corporation, L=Mountain View, ST=California, C=US. If it doesn't match, cancel — you have the wrong file.
- Review permissions & tap Install — scroll the permission list, then confirm. If Play Protect flags it, tap Install anyway (this APK was scanned as TRUSTED).
- Done — open Firefox Preview Nightly for Developers — tap Open on the install screen, or find the Firefox Preview Nightly for Developers icon in your app drawer (this build targets arm64-v8a devices).
Common install errors for Firefox Preview Nightly for Developers
- "App not installed" — usually means an older or differently-signed version is already on your device. Uninstall it first, then retry. Your data may be lost unless you back it up.
- "Parse error" — the APK is for a newer Android than yours. This version needs Android 5.0 Lollipop or later. Pick an older build from the versions list below.
- "There was a problem parsing the package" — the download was interrupted. Delete the file and re-download over Wi-Fi.
- Works on one phone but not another — this build ships arm64-v8a native code. Devices with a different CPU will reject it.