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+/* -*- js-indent-level: 2; indent-tabs-mode: nil -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+var EXPORTED_SYMBOLS = ["getUniqueDomainsVisitedInPast24Hours"];
+
+// Used by nsIBrowserUsage
+function getUniqueDomainsVisitedInPast24Hours() {
+ // The prompting heuristic for the storage access API looks at 1% of the
+ // number of the domains visited in the past 24 hours, with a minimum cap of
+ // 5 domains, in order to prevent prompts from showing up before a tracker is
+ // about to obtain tracking power over a significant portion of the user's
+ // cross-site browsing activity (that is, we do not want to allow automatic
+ // access grants over 1% of the domains). We have the
+ // dom.storage_access.max_concurrent_auto_grants which establishes the
+ // minimum cap here (set to 5 by default) so if we return 0 here the minimum
+ // cap would always take effect. That would only become inaccurate if the
+ // user has browsed more than 500 top-level eTLD's in the past 24 hours,
+ // which should be a very unlikely scenario on mobile anyway.
+
+ return 0;
+}