Firefox OS Simulator is a testing environment that allows developers to simulate the look and feel of a mobile phone running Firefox OS. The latest version includes features such as Push to Device Rotation simulation, Basic geolocation API simulation, Manifest validation, stability fixes for app installation and updates, and newer versions of the Firefox rendering engine and Gaia.
Blinged JSON Validator is a free app to validate JSON files with syntax highlighting, whitespace indentation, error messaging, and hotkeys.
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