▁release , ▁under ▁the ▁name ▁of ▁Firefox ▁Pre view , ▁was ▁released ▁on ▁that ▁day . ▁ ▁Platform s ▁ ▁Firefox ▁for ▁Android , ▁starting ▁with ▁Version ▁ 5 6 ▁from ▁September ▁ 2 0 1 7 , ▁only ▁runs ▁on ▁Android ▁version ▁ 4 . 1 ▁and ▁later ; ▁earlier ▁versions ▁of ▁Firefox ▁also ▁supported ▁earlier ▁versions ▁of ▁Android . ▁Support ▁for ▁Android ▁devices ▁that ▁run ▁Intel ▁x 8 6 ▁process ors ▁was ▁added ▁in ▁December ▁ 2 0 1 3 . ▁ ▁Platform s ▁previously ▁or ▁uno fficial ly ▁supported ▁ ▁Pre viously , ▁Firefox ▁for ▁Android ▁was ▁available ▁under ▁a ▁different ▁name , ▁Firefox ▁for ▁mobile , ▁and ▁supported ▁other ▁platforms . ▁ ▁Official ▁support ▁for ▁the ▁N ok ia ▁N 9 0 0 ▁Ma emo ▁device ▁ceased ▁with ▁version ▁ 7 . ▁ ▁Firefox ▁mobile ▁was ▁available ▁for ▁Me e Go ▁through ▁the ▁third - party ▁Open Repos ▁repository . ▁ ▁An ▁alpha ▁build ▁of ▁version ▁ 1 . 1 ▁( 1 . 1 ▁Al pha ▁ 1 ) ▁for ▁Windows ▁Mobile , ▁released ▁on ▁February ▁ 1 9 , ▁ 2 0 1 0 , ▁is ▁the ▁last ▁build ▁for ▁this ▁operating ▁system . ▁Following ▁the ▁Windows ▁Phone ▁ 7 ▁announ cement ▁and ▁Microsoft ' s ▁decision ▁not ▁to ▁release ▁a ▁native ▁development ▁k it , ▁as ▁with ▁Android ▁and ▁other ▁systems , ▁development ▁for ▁Windows ▁Mobile ▁was ▁put ▁on ▁hold . ▁If ▁Microsoft ▁releases ▁a ▁native ▁development ▁k it ▁in ▁the ▁future ▁for ▁its ▁Windows ▁Phone ▁OS