[ubuntu] Firefox Power PC ?

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http://ubuntuforums.org – If Mozilla stopped making Firefox for power pc , How is Firefox still being made for ubuntu power pc ? It is the latest version yet they do not make it anymore ? How come nobody ported over the linux version of power pc firefox to mac tiger or leopard ? It seems that it would be possibe and yes I know there is tenfourfox but I am talking about a real firefox like on ubuntu . (Hardware)