Tracking history would bound right into the 'creepy' range of data collection IMO. But if you were fine with that, it's not hard to imagine such a solution tracking how much time you spent on a given page and using that to make an educated guess that you 'meant' to bookmark it. Or at least weight search results accordingly.
Though the logistics of cloud-storing every single page every user visits would quickly become non-trivial.
And your want #2 seems like a simple UI task. IE already has/had a "bookmark all open tabs"-style menu option -- and I thought the others did too, but I'm not seeing it at the moment.
It's only creepy if it's retained or used against my wishes. In a fantasy world of free data storage, the ability to have a complete history of my life and an ability to search it instantly is incredibly useful. And yes - incredibly dangerous but I'd like the option.
Though the logistics of cloud-storing every single page every user visits would quickly become non-trivial.
And your want #2 seems like a simple UI task. IE already has/had a "bookmark all open tabs"-style menu option -- and I thought the others did too, but I'm not seeing it at the moment.