Mozilla has started rolling out the latest version of Firefox Preview (v4.0.0) for Android. The newest update brings a handful of useful features including top sites, add-on support, and a password manager.
The new password manager lets you save all your login credentials and sync your passwords across all your devices through a Firefox account. You may connect your Firefox account by visiting Firefox Pair from PC and scanning the QR code from your mobile.
The Firefox Preview 4.0 has not been rolled out to Google Play Store at the time of writing this article, at least on my device. You may download the APK from Mozilla’s GitHub or APKMirror to start using the new version right now.