Session Manager

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由 Firefox 用户 95e2b2 发表于 Nov. 21, 2017 · 永久链接

57 looks good. but need Sessoin Manager in advance. So revert the vesion to 56. FF guys would support SM developers to make it compatible.
Wanna revert ?, https://support.mozilla.org/en-US/kb/install-older-version-of-firefox