"While the phone seems to be a bit outdated in the hardware department, keep in mind that Firefox OS is based on HTML5, JavaScript and other web-based technologies; it doesn't necessarily need the hardware that's packed behind the newer iOS and Android platforms."
HTML5, JavaScript, and other web-based technologies benefit greatly from faster processors (and likewise, experience suffers greatly from slower processors). I would be very skeptical that a 1GHz single-core CPU with 256MB of RAM allows for a good smartphone user experience under any circumstance.