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Firefox already does this - that's why it's the awesome bar. You can see it in action here https://youtu.be/pKE0Oc3yIBs?t=53

Awesome bar is nice, it's like using a crippled opera from 10 years ago.

Sadly, I have found that almost any new feature of browsers these days is like using a crippled opera from 10 years ago.