I'm not sure if you understood what I was saying because the window title would remain the same (i.e. the browser). You would just be clicking inside and outside of a textbox within the same browser.

As for taking a screenshot - that wouldn't help either with something meaningful like a password. Not to mention that doing screenshots totally changes the dynamic of a "key logger" and exponentially raises the amount of storage needed and makes it even more difficult to glean useful data from it.

I think you're trying to stretch to make this countermeasure "easily defeated" when it really isn't.