Is the Firefox Mobile OS System a Droid Killer?

Neemias Santos Mazzoco, 29, is looking at phones at a São Paulo store for Vivo, a Brazilian carrier owned by Telefónica. He has a 2007-vintage Nokia. He ticks off the things he likes about it: â??No one wants to steal this phone. Itâ??s almost unbreakable, and the battery lasts for three days.â?