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