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Firefox OS Simulator is a test environment for Firefox OS. Use it to test your apps in a Firefox OS-like environment that looks and feels like a mobile phone. After installing it, go to Web Developer > Firefox OS Simulator to access its features.
What's new in this version:
Push to Device Rotation simulation Basic geolocation API simulation Manifest validation Stability fixes for installation and updates to apps Newer versions of the Firefox rendering engine and Gaia (the UI for Firefox OS)