Rated 5 out of 5 stars

by Firefox user 95e2b2 on Nov. 21, 2017 · permalink

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