Firefox Fast & Private Browser
v139.0.3 · 91.1 MB · code 999999999
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File information
UpdatedApr 6, 2026
PublishedDec 4, 2018
Packageorg.mozilla.firefox
Versionv139.0.3 (999999999)
Size91.1 MB
MD5ee50b6853bdd6efd86cd24de447205ab
Min SDK21
ABIsarmeabi-v7a
Malware scanUNKNOWN
Signature SHA15B:9A:EA:26:60:9D:EF:FC:2A:A5:A0:E6:F8:39:CA:36:BD:71:71:E9
SignerC=BD, ST=Comilla, O=RAIYAN_MODS, CN=RAIYAN
Total downloads500,000,000
This version500,000,000
DeveloperMozilla
Age ratingEveryone
What's new in v139.0.3
- Security fix.
Security scan
UNKNOWN
- Developer signature verified 2025-06-15
- Signature SHA1 5B:9A:EA:26:60:9D:EF:FC:2A:A5:A0:E6:F8:39:CA:36:BD:71:71:E9
- File MD5 ee50b6853bdd6efd86cd24de447205ab
How to install Firefox Fast & Private Browser v139.0.3 on Android 5.0 Lollipop+
Takes about 2 minutes. You'll need roughly 91.1 MB of free storage.
- Grab org.mozilla.firefox_999999999.apk — hit the Download button above (91.1 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 ee50b6853bdd6efd…. Any difference means the file is corrupted or tampered — delete and re-download.
- Open the APK — tap the download notification, or find org.mozilla.firefox_999999999.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 C=BD, ST=Comilla, O=RAIYAN_MODS, CN=RAIYAN. 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 UNKNOWN).
- Done — open Firefox Fast & Private Browser — tap Open on the install screen, or find the Firefox Fast & Private Browser icon in your app drawer (this build targets armeabi-v7a devices).
Common install errors for Firefox Fast & Private Browser
- "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 armeabi-v7a native code. Devices with a different CPU will reject it.