This API is available on Firefox OS for internal applications only.
Retrieval of the max storage amount is now done via the MozNetworkStatsManager.maxStorageAge attribute.
Summary
The maxStorageSamples property indicates the maximum number of date usage chunks stored for each type of connection.
A data usage chunk is a MozNetworkStatsData object representing the total number of bytes received and sent during a given amount of time (this amount of time is accessible through the sampleRate property).
Syntax
var max = navigator.mozNetworkStats.maxStorageSamples;
Value
A number.
Specifications
Not part of any specification.