Firefox Fast & Private Browser v55.0.2

APK · 37.6 MB · version code 2015506297 · Android 4.0.3+ · uploaded Aug 16, 2017

a63e98c49d2f8795d174032dfb8980f5 TRUSTED

  • Same certificate as v68.10.1, which matches Google Play Details

Quick check before downloading

Answer this to unlock the download. It keeps automated downloaders away.

Compared with the latest version

The latest version is v157.0.1, uploaded Oct 6, 2026 — about 9 years after this one.

  • Size: this file is 37.6 MB; the latest is 128.1 MB (90.4 MB larger).
  • Android: this version needs Android 4.0.3+; the latest needs Android 8.0+. Use this one if your device runs an older Android release.
  • The latest version asks for 22 more permissions: Approximate location, Access local network, Credential manager query candidate credentials, Credential manager set origin, Run foreground services, Foreground service data sync, Foreground service media playback, Foreground service special use….
  • The latest version no longer asks for: View Wi-Fi connections, Authenticate accounts, Change wifi state, Find accounts on the device, Manage accounts, Nfc, Read shared storage, Read sync settings….

File information

Version
v55.0.2 (2015506297)
Uploaded
Aug 16, 2017
Size
37.6 MB
Requires
Android 4.0.3+ (API 15)
CPU support
ARM 32-bit
Google Play services
Required
Graphics
OpenGL ES 2.0+
Screen
Small screens and larger
Android TV
Supported
MD5
a63e98c49d2f8795d174032dfb8980f5
Signing certificate (SHA-1)
92:0F:48:76:A6:A5:7B:4A:6A:2F:4C:CA:F6:5F:7D:29:CE:26:FF:2C
Signed by
CN=Release Engineering, OU=Release Engineering, O=Mozilla Corporation, L=Mountain View, ST=California, C=US
File name
org-mozilla-firefox-2015506297-31513367-a63e98c49d2f8795d174032dfb8980f5.apk
Package
org.mozilla.firefox
Downloads (all versions)
500M+
Age rating
PEGI 3 · Everyone

What's new in v55.0.2

Thanks for using Firefox! Here's what we've improved in this version: * Further enhancements to the recently-deployed mitigations for the Local Mess privacy leak. Have feedback or suggestions? We'd love to hear from you at https://mzl.la/AndroidSupport

Permissions (28)

This version requests 28 permissions, 8 of them sensitive.

Security & authenticity

Security rating: Trusted

Signing certificate

  • Certificate issued to “Mozilla Corporation” This is the certificate of the Google Play version.
  • Same certificate as v68.10.1, which matches Google Play v68.10.1

Store checks

  • Developer signature not checked yet Apr 26, 2025
  • Antivirus scan passed Jun 11, 2020
  • Tested by the source store's staff Nov 25, 2017
  • Uploaded by “unkash” Silver tier · 3,726 followers · uploading since 2013

Scans come from the source store; the certificate comparisons are AAPKs's own, made from the files' published signatures (6 other versions compared). AAPKs doesn't scan files itself.

How to install Firefox Fast & Private Browser on Android 4.0.3+

You'll need about 75.2 MB of free space.

  1. Download the APK — tap Download APK above (37.6 MB). Chrome shows “File might be harmful” for every APK file; choose Download anyway only if you trust this file.
  2. Open the file — tap the download notification, or open Files › Downloads and tap org-mozilla-firefox-2015506297-31513367-a63e98c49d2f8795d174032dfb8980f5.apk.
  3. Allow the install (first time only) — Android 8 and later asks for permission the first time an app opens an APK: tap Settings in the prompt, turn on Allow from this source, then go back. Manual path: Settings › Apps › Special app access › Install unknown apps (on Samsung: Settings › Apps › ⋮ › Special access). On Android 7 and older: Settings › Security › Unknown sources.
  4. Check the file (optional) — the MD5 of the downloaded file should be a63e98c49d2f8795d174032dfb8980f5. If it differs, the file is damaged or was changed: delete it and download again.
  5. Tap Install — Android asks “Do you want to install this app?”. If Google Play Protect shows a warning, read it before you continue: the source store rated this file Trusted, but only install apps from sources you trust. If an earlier version is installed, this one only installs as an update when it is signed with the same certificate (SHA-1 shown above).
  6. Open Firefox Fast & Private Browser — tap Open on the install screen, or find it in your app drawer.
Common install problems
  • “App not installed” — a version signed with a different certificate, or a newer version, is already installed (Android doesn't allow downgrades). Uninstall it first; back up your data, because uninstalling deletes it.
  • “There was a problem parsing the package” — the file is incomplete, or your Android is too old (this version needs Android 4.0.3+). Download it again, or pick an older version.
  • “App not compatible with your device” — this build contains native code for ARM 32-bit only. Devices with other processors can't install it.
  • Blocked by Play Protect — Play Protect checks apps from outside the Play Store. Only continue if you trust the source.

Other versions (11)

v157.0.1 LATEST Oct 6, 2026 128.1 MB TRUSTED v157.0 Sep 30, 2026 128 MB TRUSTED v156.0.1 Sep 23, 2026 127.3 MB TRUSTED v153.0.4 Aug 12, 2026 126.4 MB TRUSTED v68.10.1 Nov 4, 2025 51.1 MB TRUSTED v55.0.2 THIS FILE Aug 16, 2017 37.6 MB TRUSTED v45.0.2 Apr 12, 2016 39.5 MB TRUSTED v31.3.0 Jan 28, 2015 29.8 MB TRUSTED v31.0 Jul 22, 2014 28.7 MB TRUSTED v4.0b3 Nov 9, 2025 13.4 MB TRUSTED v40.0 Sep 17, 2015 40.9 MB UNKNOWN

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