Although I like the idea of saving the session, doing this via bookmark is basically duplicating a bookmark. ie I had one site bookmarked 19 times. Surely, there has to be a better way than duplicating bookmarks.

Update: I had to uninstall the addon, it makes no sense duplicating bookmarks. Besides I want to save the session, not bookmark it. I understand that's it's intended purpose. But having multiple copies of each bookmark is more trouble than it's worth. A better way, if it were even possible would be to update the same bookmark, but creating and duplicating hundreds of bookmarks that you never wanted in the first place seems counter intuitive.