Mozilla Fenix is a new browser currently in the works based on GeckoView, which has been marked as a possible replacement for Firefox mobile browser in both Android and iOS platforms.
While Mozilla had outlined its plan for replacing Firefox (also known as 'Fennec' in its document), Firefox 67 and 68 for Android slated for May 14 and July 9 release, respectively, will continue to receive security patches, with Firefox version 68.1 coming on September 3, and followed by version 68.2 October 22, according to the document.
Mozilla had to divert resources meant for Fenix development to fix bugs in the current Firefox version, with the Android browser upgrade pegged on version 68 to help accelerate Fenix development, but also, it means no new features will be arriving to Firefox for Android.
The current Firefox for Android browser End-Of-Life cycle will be sometime next year, after which Fenix will be replacing it. Albeit, it runs a completely different architecture, Gecko Quantum from Mozilla, the only alternative browser engine available now, outside Chromium.
Mozilla has once again holds its own, when all other browser vendors, including Microsoft have opted for Chromium and it has assured on speed and performance as with Quantum Firefox, more smarter memory management and nifty new capabilities.
Early preview of Fenix, shows that it changes tabbed-browsing significantly, even as all the major mobile browsers support tabbed-browsing. Fenix is akin to desktop browsers tabs, though users are allowed to open multiple tabs and tabs are retained across different browsing sessions.
The idea of changing tab management in Fenix is quite interesting, with such benefits as using less RAM as other browsers on mobile devices since tabs are kept open only during browsing but not across all sessions.
Mozilla, however did not say when Fenix will make debut in the document, but certainly when Fenix is ready, users of the legacy version of Firefox for Android will be migrated to the new mobile browser.