SweetP Productions has announced SessionRestore 1.0, a Safari tab management extension. 

It allows you to save your browsing session, close all windows then start with a fresh session. It’s completely written with Apple’s Swift as a native Safari App Extension.

SessionRestore 1.0 requires macOS 10.14.4 or higher and Safari 12.1 or later. It costs $9.99 and is available at the Mac App Store (https://itunes.apple.com/app/sessionrestore/id1463334954).