BARCELONA, Spain--Firefox OS is real, and it works.Mozilla's browser-based phone technology is a credible option for the emerging markets where it'll first arrive starting in the second quarter. The nonprofit debuted the first version of the software at the Mobile World Congress show in front of 700 people curious to see how well it works. For that mobile-savvy audience, the answer is this: not well enough. For wealthier customers, Firefox OS will have a hard time standing up to the two powerhouses of the mobile market, Google's Android and Apple's iOS. With Firefox OS, Mozilla is in a race to improve its software and attract developers and partners faster than its rivals spread to the low-end smartphone market. Major allies like Telefonica, Deutsche Telekom, Telenor, and China Mobile will help spread Firefox OS around the world to markets where feature phones still rule. Firefox OS looks familiar to anyone who's used Android and iOS: when you turn it on, you're faced with the familiar grid of apps. Swiping left and right slides in other pages of apps. And across the bottom of each page is a fixed set of four apps: the phone dialer, a text-messaging app, the Firefox browser, and the camera app.
On the lower-end Firefox OS phones I tried -- the Geeksphone Keon and ZTE Open -- touch operations were somewhat sluggish, and accurate typing was difficult. It's not clear how much of this was because of the hardware and how much because of the software, but they are low-budget phones, though. On the higher-end Geeksphone Peak, swiping and scrolling and typing worked better.Firefox OS comes with a range of built-in apps such as Facebook and Wikipedia, and Nokia's Here provides mapping services. A long-press on the home button invokes a task switcher so you can juggle among open apps. A contacts app lets you open up a screen full of information about people you know. It serves as a hub to phone them, send e-mail or text messages, or check their Facebook walls. Facebook integration also lets people import their contacts; Mozilla plans to add import mechanisms for services like Gmail, Yahoo Mail, and Hotmail -- something it knows how to do by virtue of its Thunderbird e-mail software for PCs.
A camera app, which also is accessible from the lock screen, has tabs for taking photos or videos, and it's got a link to the built-in gallery app. That app lets you crop photos, apply some basic color filters, adjust contrast, and take actions like sharing photos on Facebook or by Bluetooth wireless networking.