Kwa nsanja ya Android losindikizidwa kutulutsidwa kwa msakatuli woyeserera Kuwona kwa Firefox 4.0, yopangidwa pansi pa code Fenix m'malo mwa Firefox ya Android. Firefox Preview amagwiritsa Injini ya GeckoView, yomangidwa paukadaulo wa Firefox Quantum, ndi malaibulale angapo Mozilla Android Components, zomwe zimagwiritsidwa ntchito kale kupanga asakatuli Yang'anirani Firefox и Firefox lite. GeckoView ndi mtundu wina wa injini ya Gecko, yopakidwa ngati laibulale yosiyana yomwe ingasinthidwe palokha, ndipo Android Components imaphatikizapo malaibulale omwe ali ndi zida zokhazikika zomwe zimapereka ma tabo, kumalizidwa kolowera, malingaliro osakira ndi mawonekedwe ena asakatuli. Nkhaniyi idzasindikizidwa m’katalogu posachedwapa Google Play (imafuna Android 5 kapena mtsogolo kuti igwire ntchito)