Yes, I found that link you cited a day ago and tried it before seeing your post.
Found my file under ~/Library/Containers/com.apple.Safari/Data/Library/Preferences/com.apple.Safari.Extensions.plist.
I dragged that file onto SRExport, but a "SRExport quit unexpectedly" error was returned:
Crashed Thread: 0 Dispatch queue: com.apple.main-thread
went to https://sessions-extension.github.io/Sessions/export.html , downloaded the script and following the instructions attempted to run it. Terminal returned the following error:
ERROR /Users/danielcarlock/Library/Safari/Databases/safari-extension_yoo.david.sessions-deub45nr9t_0/ is either unreadable or contains no databases.
No data is transmitted to mine or anyone else’s server.
SessionRestore doesn’t store anything related to your browsing history either - unless you have specifically enabled autosave. Even then the saves are only local, and you can delete an autosave session at anytime.