В профиле Firefox есть файл recovery.js, в нем Firefox хранит все открытые прошлый раз вкладки, нужно выдернуть ихние
и вставить в другой файл списком в виде рефссылок.
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статье всё выходит, но нужно ставить дополнения и проблема с кодировкой.