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This API is available on Firefox OS for internal applications only.
Summary
The txBytes property is a number representing the amount of bytes sent for a given connection. The amount is the total number of bytes sent for MozNetworkStatsManager.sampleRate seconds at MozNetworkStatsData.date.
If no network stats are available for the given date, this property is undefined (which is different than 0).
Syntax
var bytes = instanceOfMozNetworkData.txBytes;
Value
A number or undefined.
Specifications
Not part of any specification.