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Nicholas Nethercote authored
This also removes the following prefs, because they're unused: - media.autoplay.allow-muted pref - media.autoplay.blackList-override-default Differential Revision: https://phabricator.services.mozilla.com/D36396 --HG-- extra : rebase_source : 0570540496302b3efedadf4d5115ee5422d5c279
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