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The reason is Fennec the Firefox browser in Mobile version is currently reportedly was tested by Firefox team. But unfortunately, there is no further information about when Firefox Mobile version or Fennec final version for Android will be realized.
After several test in beta version, Fennec initially has been installed in Nokia N900 smart phone.
Fennec is designed with the same features as the Firefox version on a computer. Because Fennec technology using similar to desktop versions, including HTML rendering technology. Fennec is expected to maximize the performance of superior handsets with software based on open source, such as Android.