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작성: Andrew, 날짜: 6월 30, 2021 · 고유 주소

If you want a 'Mark All Read' button that works for Thunderbird 78+ install https://addons.thunderbird.net/en-GB/thunderbird/addon/next-unread-group/ and change the value for mailnews.nav_crosses_folders in about:config from 1 to 2.