diff --git a/dom/webidl/MozNetworkStats.webidl b/dom/webidl/MozNetworkStats.webidl
index fdb6d8f40da57..066cd62e79c8e 100644
--- a/dom/webidl/MozNetworkStats.webidl
+++ b/dom/webidl/MozNetworkStats.webidl
@@ -16,6 +16,13 @@ dictionary NetworkStatsGetOptions
    */
   DOMString appManifestURL;
   DOMString serviceType;
+  /**
+   * If it is set as true, only the browsing traffic, which is generated from
+   * the mozbrowser iframe element within an app, is returned in result.
+   * If it is set as false or not set, the total traffic, which is generated
+   * from both the mozapp and mozbrowser iframe elements, is returned.
+   */
+  boolean browsingTrafficOnly;
 };
 
 dictionary NetworkStatsAlarmOptions
@@ -35,6 +42,13 @@ interface MozNetworkStats {
    */
   readonly attribute DOMString    appManifestURL;
 
+  /**
+   * True if this stats is the browsing traffic of an app (the traffic generated
+   * by a mozbrowser iframe element).
+   * Otherwise this stats represents the total traffic of an app.
+   */
+  readonly attribute boolean      browsingTrafficOnly;
+
   /**
    * Service type is used to retrieve the corresponding "system-only" stats.
    * E.g., "Tethering", "OTA", etc.