[cptskippy]

The browser have to intercept 302 redirects and javascript .location assignments, open safe locations in a different container. Would that be a new window or the same window but with container change?

In the former scenario you'd basically get 2 new tabs, in the later you'd have a tab represent two different containers based on where you navigate in history.

Either way it sounds unsavory.

[StavrosK]

Firefox already does what you describe. It's a new tab.