Firefox's mobile operating system showed up on a mystery phone tonight at a pre-CES event ahead of its unveiling later this year, carrying no branding and looking light on features. Sadly, the WiFi in the event space didn't give us much of a chance to explore the OS' inner workings, and the phone was dubbed a "mystery" device by Mozilla reps, but we did snap some pictures of it. We also know that it's got at least an ARMv6 CPU and 256MB of RAM, and likely more power than that. Mozilla's planning a 2013 launch of the Chrome OS -- an OS powered entirely by HTML5 -- in partnership with Telefonica, Qualcomm, and "a long list of in
