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This API is available on Firefox OS for internal applications only.
Clearing of all network statistics data is now done via the MozNetworkStatsManager.clearAllStats method.
Summary
The clearAllData method allows to clear all data usage chunks that were previously stored.
A data usage chunk is a MozNetworkStatsData object representing the total amount of bits received and sent during the amount of time defined by the sampleRate property.
Syntax
var request = navigator.mozNetworkStats.clearAllData();
Return
A DOMRequest object to handle the success or error of the operation.
Specifications
Not part of any specification.