What do you mean by no option to save sessions?
There's a red heart icon that has a tooltip with "Save Session".
Auto-save is not saving in bookmarks, only manual saving will do so because otherwise I would create thousands of almost useless bookmarks for users.
The addon should work as intended, but in case some other addon creates some weird incompatibility it might not, but that's something I can't fix or change. Though, there should clearly be no issues to save a certain session.