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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.
Note: This download is an add-on for Firefox (only works with Firefox 16.0 and later) so we suggest you download this file which is a .xpi using that browser.
Since then, apart from verifying and making the above functionality stable, other notable improvements are:
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