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https://support.mozilla.org/t5/Manage-preferences-and-add-ons/Java-%E3%83%97%E3%83%A9%E3%82%B0%E3%82%A4%E3%83%B3%E5%88%A9%E7%94%A8%E3%82%AC%E3%82%A4%E3%83%89/ta-p/9577