Firefox Browser for Android
v31.3.0 · 29.8 MB · code 2014080005
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File information
UpdatedJan 28, 2015
PublishedJan 28, 2015
Packageorg.mozilla.firefox
Versionv31.3.0 (2014080005)
Size29.8 MB
MD54629c54f1f225ccde093632756f015c4
Min SDK8
ABIsarmeabi
Malware scanTRUSTED
Signature SHA192:0F:48:76:A6:A5:7B:4A:6A:2F:4C:CA:F6:5F:7D:29:CE:26:FF:2C
SignerCN=Release Engineering, OU=Release Engineering, O=Mozilla Corporation, L=Mountain View, ST=California, C=US
Total downloads500,000,000
This version500,000,000
DeveloperMozilla
Age ratingLow Maturity
What's new in v31.3.0
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
* 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
Security scan
TRUSTED
- Developer signature verified 2025-03-29
- Scanned for malware 2020-10-14 13:54:37
- Signature SHA1 92:0F:48:76:A6:A5:7B:4A:6A:2F:4C:CA:F6:5F:7D:29:CE:26:FF:2C
- File MD5 4629c54f1f225ccde093632756f015c4
How to install Firefox Browser for Android v31.3.0 on Android API 8+
Takes about 2 minutes. You'll need roughly 29.8 MB of free storage.
- Grab org.mozilla.firefox_2014080005.apk — hit the Download button above (29.8 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 4629c54f1f225ccd…. 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_2014080005.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 Browser for Android — tap Open on the install screen, or find the Firefox Browser for Android icon in your app drawer (this build targets armeabi devices).
Common install errors for Firefox Browser for Android
- "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 API 8 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 native code. Devices with a different CPU will reject it.