Mozilla is investing all its time and resources on Fenix for Android instead of Fennec, which will be replaced by the former in 2020. Do note Fenix is an internal codename for Firefox Preview which is currently in development. We’ve covered when the first beta for Firefox Preview was available, nothing changed in terms of features since then, you should expect the final version to be more stable with fewer bugs.
While the company highlights enhanced tracking protection and notifications support for downloads as new features, here is the total changelog for version 3.0.0 according to Mozilla.
1. Enhanced Tracking Protection available by default protects users from Cryptomiers, fingerprinters, analytics and ad trackers.
2. Firefox Preview allows to open links in Private tabs by default.
3. You can take advantage of the option available in settings to clear browser data on exit.
4. You’ve total control in what information to sync to devices.
5. Set an autoplay or background behavior for playing audio/video
6. See and manage downloads.
9. You can force enable Zoom on all websites in Firefox Preview even” if website has limited zoom functionality.