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Firefox is the browser built for the way you use the Web on your mobile phone. These key design principles are at the heart of the browsing experience: minimize typing, let the Web have center stage, and seamlessly synchronize your desktop and mobile browsing, to name a few. It’s built on the same browser engine as Firefox 3.6 for desktop computers with some extensive under the hood work to optimize for mobile. Secure, powerful and customizable -- Firefox for the Nokia N900 is packed with your favorite features.

https://www.mozilla.com/en-US/mobile/1.0/releasenotes/