Tab or Session Manager for Safari 12? [duplicate]

Solution 1:

I have had the same question and found no answer. So I myself developed a Safari extension named Tab Space which could handle this task for me. Try it if you want.

Solution 2:

Followup to my own question. Based on Marc Wilson suggestion I'm trying SessionRestore from SweetProductions: https://sweetpproductions.com/ - thus far it does work.

Solution 3:

Tabs Saver for Safari (https://apps.apple.com/in/app/tabs-saver-for-safari/id1440006971?mt=12) is a good one.