The only problem is that this would break some things like certain SSO systems, so you would have to implement a white-list to allow shared state, and the UX for that would be abused to nag users to whitelist everything. Most people would just click “OK” by default like they do with everything else, and those of us with more sense would have a new reason to be irritated by incessant nagging.
this is the way.
Though I'm guessing it would work in the cases being discussed in this article & thread: when you are navigating into a site (such as linkedin) from another, rather than following internal links.
In Safari if you open a new tab, don't navigate anywhere, and click back, the tab closes and takes you back to the originating page. I've gottent so used to it, I now miss it in any other browser