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When I try to open the downloaded file, a security warning restricts me from opening the file.

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I have the new Motorola Bravo which is on the Android 2.1 system. When I try to open the downloaded file, a warning appears saying "This application comes from an unknown source, and for your security only applications from trusted sources can be installed". Is the download corrupt? I would think not, but I am very confused.

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Unfortunately, AT&T disables the ability for its Android phones to install applications that aren't distributed through the Android Market.

If this phone is not AT&T-branded, then you might be able to enable "Non-Market sources" in the "Applications" section of the Settings app.

If it is, then you might be able to use the Android developer tool "adb" to install Firefox on your phone (search the web for instructions), or you can wait for our next beta release which should be available through the Market later this month.