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I have downloaded Firefox Mobile(Fennec) in my Android and whenever I click "Install",it shows "Not installed" after some time.Why?

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I downloaded Firefox Mobile(Fennec) from mobyware.net and I think this is not an unsupported file as all of my unsupported files read as "No application can perform this action" but this does not.Then this message comes on my screen with the Firefox logo,"Do you want to install this application?" When I touch "Install",it starts installing as hoped.But it ends with this message,"Not Installed" with a green Tick before it.

I downloaded Firefox Mobile(Fennec) from mobyware.net and I think this is not an unsupported file as all of my unsupported files read as "No application can perform this action" but this does not.Then this message comes on my screen with the Firefox logo,"Do you want to install this application?" When I touch "Install",it starts installing as hoped.But it ends with this message,"Not Installed" with a green Tick before it.

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It's always safer to install from mozilla.org than a third party website.

According to a random website... the Samsung Galaxy Y uses a Broadcom BCM21553 processor. This processor unfortunately does not support the full ARM version 7 instruction set, so Firefox cannot run on it.