▁of ▁EC MA Script ▁development ▁shift ed ▁from ▁EC MA Script ▁ 4 , ▁which ▁was ▁partially ▁implemented ▁by ▁then ▁existing ▁T amarin ▁source ▁code ▁and ▁was ▁meant ▁to ▁be ▁completed ▁by ▁joined ▁efforts ▁of ▁Ad obe , ▁Moz illa ▁and ▁its ▁community ▁within ▁the ▁T amarin ▁Project , ▁to ▁EC MA Script ▁Harm ony . ▁ ▁T amarin ▁continues ▁to ▁be ▁used ▁in ▁Ad obe ▁Flash ▁Player , ▁but ▁it ▁has ▁not ▁replaced ▁Spider Mon key ▁as ▁the ▁JavaScript ▁engine ▁of ▁Moz illa ▁applications . ▁ ▁The ▁only ▁part ▁of ▁T amarin ▁used ▁in ▁modern ▁Moz illa ▁applications ▁( i . e . ▁Firefox ▁ 3 . 5 +) ▁via ▁Spider Mon key ▁is ▁N ano J IT , ▁a ▁module ▁that ▁is ▁used ▁to ▁generate ▁native ▁code ▁when ▁performing ▁just - in - time ▁compilation . ▁ ▁What ▁T amarin ▁is ▁not ▁Ad obe ▁contributed ▁code ▁for ▁its ▁Action Script ▁Virtual ▁Machine ▁ 2 ▁and ▁the ▁J IT ▁compiler . ▁The ▁Action Script ▁compiler ▁is ▁also ▁open ▁source ▁and ▁can ▁be ▁downloaded ▁from ▁GitHub . ▁ ▁T amarin ▁is ▁not ▁the ▁same ▁as ▁Ad obe ▁Flash ▁Player , ▁which ▁remains ▁closed ▁source . ▁The ▁T amarin ▁virtual ▁machine ▁is ▁only ▁a ▁part ▁of ▁Flash ▁Player . ▁ ▁Rel ated ▁projects ▁Two ▁projects ▁related ▁to ▁T amarin ▁were ▁announced ▁on ▁July ▁ 2 5 , ▁ 2 0 0 7 ▁in ▁Br end an ▁E ich ' s ▁ke yn ote ▁at ▁The ▁Ajax ▁Exper ience ▁West : ▁Iron Mon key ▁and