▁F enne c ▁used ▁the ▁Ge cko ▁engine , ▁for ▁example , ▁version ▁ 1 . 0 ▁used ▁the ▁same ▁engine ▁as ▁Firefox ▁ 3 . 6 , ▁and ▁the ▁following ▁release , ▁ 4 . 0 , ▁shared ▁core ▁code ▁with ▁Firefox ▁ 4 . 0 . ▁Its ▁features ▁include ▁HTML 5 ▁support , ▁Firefox ▁S ync , ▁add - ons ▁support ▁and ▁tab bed ▁brow sing . ▁ ▁Pl ugin ▁support ▁was ▁initially ▁disabled ▁by ▁default , ▁removing ▁compatibility ▁with ▁popular ▁web ▁content ▁types ▁such ▁as ▁Ad obe ▁Flash . ▁In ▁September ▁ 2 0 1 1 , ▁Flash ▁support ▁was ▁implemented ▁in ▁pre - release ▁builds ▁for ▁pre - H oney comb ▁versions ▁of ▁Android . ▁Flash ▁support ▁for ▁▁ 4 . x ▁has ▁been ▁enabled ▁for ▁most ▁smart ph ones ▁in ▁version ▁ 1 4 . 0 ; ▁later ▁it ▁was ▁removed ▁in ▁version ▁ 5 6 . 0 . ▁ ▁The ▁browser ' s ▁version ▁number ing ▁was ▁b ump ed ▁from ▁version ▁ 2 . 0 ▁to ▁version ▁ 4 . 0 ▁to ▁more ▁closely ▁match ▁desktop ▁releases ▁of ▁Firefox ▁since ▁the ▁rendering ▁engines ▁used ▁in ▁both ▁browsers ▁are ▁the ▁same . ▁ ▁In ▁June ▁ 2 7 , ▁ 2 0 1 9 , ▁Moz illa ▁announced ▁it ▁was ▁design ing ▁a ▁new ▁Android ▁web ▁browser ▁re built ▁with ▁Ge cko View , ▁a ▁Ge cko - based ▁rendering ▁framework ▁for ▁Android , ▁as ▁well ▁as ▁the ▁Moz illa ▁Android ▁Com ponents . ▁The ▁first ▁preview