MozNFC is the top level API for operating in NFC Reader/Writer mode, NFC P2P mode and NFC Card Emulation mode.
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.
The getNFCTag() method of the MozNFC interface returns an NDEF tag interface (MozNFCTag object) used to interact with NFC Tags.
The mozNfc property returns a MozNFC object that can be used to access Firefox OS's NFC functionality: Near Field Communication (NFC) is a short range radio technology used to exchange data and tags between mobile devices by tapping them together or moving them close to each other.
The id property of the MozNDEFRecord interface is application dependent (an appropriate id can be used, depending on functionality), but generally will return an NDEF Record identifier. 
The payload property of the MozNDEFRecord interface is application dependent (for example, a contacts application could contain URLs, mime-types, postal address, etc., to emulate vCards).
The tnf property of the MozNDEFRecord interface contains the Type Name Format (3-bit field) of the record. This field is required.
The type property of the MozNDEFRecord interface ... fill in description of what it does
The onpeerlost event handler of the MozNFC interface handles the peerlost event, which is fired when the MozNFCPeer object received in MozNFC.onpeerready  is no longer available or not in proximinty (e.g. the peer device moves out of range.).
The onpeerready event handler of the MozNFC interface handles the peerready event, which fires when a suitable peer (an NFC-enabled device) comes into range of the device your NFC application is running on.
A sequence of <MozNDEFRecord> records to send.
The close() method of the MozNFCTag interface closes a current NFC Tag session.
The connect() method of the MozNFCTag interface accepts a technology type to use for subsequent operations.
The getDetailsNDEF() method of the MozNFCTag interface retrieves basic metadata describing the NDEF tag.