Firefox is better known for its Web browser. Now, the people behind it are trying to adapt it to run smartphones targeted at emerging markets.
Firefox OS launched last summer with three phones, priced around $50 to $70. They are in available in 15 countries, but not in the U.S.
At the Barcelona show, Mozilla unveiled plans to expand to additional markets in Latin America and eastern Europe, while ZTE announced two new models. Chipmaker Spreadtrum Communications Inc. also announced a blueprint for any phone maker to make $25 smartphones.
The home screen and icons resemble what's found on iPhones and Android.
Where Firefox OS starts to differ is in apps. With iPhones and Android, you go to an app store to get new apps. With Firefox OS, you typically have instant access to all apps, the same way you can visit a website for the first time without installing anything.
The catch is you need an Internet connection to use apps that aren't on your phone, but many apps need that access anyway to refresh news, social networks or restaurant guides.
Firefox OS also has a universal search for all content on the phone and online.
There's another neat feature coming to Firefox OS. Swipe from the left side of the screen to flip through recent apps one by one, just like hitting the back button on a Web browser.
