I understand the example of signing in to this website while unsandboxed and then still being signed in when sandboxed. I do this all the time with extensions like Lastpass. But I did not type "south park" unsandboxed. I only typed it in while sandboxed. So suddenly the unsandboxed knows all about south park. Now if I was signed into Google/Youtube that would make sense, but I am not. It's sort of like going to ebay sandboxed (without signing in) and clicking on auction pages with PC's. Then going to unsandboxed and these PC auctions appear in my "last viewed" list. This of course does not happen. I'm just siting an example. Anyway, maybe my brain is a little slow and I'm missing something. It still hasn't CLICKED for me.