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Re:Firefox Focus – A new private browser for iOS and Android by gardnr on Saturday August 19, 2017 @01:18PM (#15054465)
Can you offer more information about why you trust it?
Re:Firefox Focus – A new private browser for iOS and Android by chrisper on Monday August 21, 2017 @01:03AM (#15062065)
Sure. Sorry for the late response! It is basically maintained by a reputable source (android police) and they also seem to take security seriously. If they cannot verify the origin of an APK for sure, they rather reject it.

http://www.androidpolice.com/2014/11/19/meet-apk-mirror/

https://www.apkmirror.com/faq/#What_measures_do_you_take_to_...