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The near property tell if there is an object close to the device (true) or not (false).
API Firefox OS Property Proximity

Vibration API

Most modern mobile devices include vibration hardware, which lets software code provide physical feedback to the user by causing the device to shake. The Vibration API offers Web apps the ability to access this hardware, if it exists, and does nothing if the device doesn't support it.
Beginner Firefox OS Mobile Vibration


Specifies an event listener to receive disabled events. Those events occur when the device's FM radio is turned off.
API Firefox OS Property Reference WebFM


MozNFC is the top level API for operating in NFC Reader/Writer mode, NFC P2P mode and NFC Card Emulation mode.
API Firefox OS Interface MozNFC NFC Reference


The getNFCPeer() method of the MozNFC interface returns a Peer to Peer DOM object (MozNFCPeer) that can be used to transfer data to another NFC-enabled device.
API Firefox OS Method MozNFC NFC Reference


The getNFCTag() method of the MozNFC interface returns an NDEF tag interface (MozNFCTag object) used to interact with NFC Tags.
API Firefox OS Method MozNFC NFC Reference