Comment 22 for bug 239831

I disagree. When I first filed this issue 3 years ago my original complaint was
that if Google.com finishes loading while I am in the middle of entering a new
URL in the location bar, it should not steal the focus away.

Specifically, if my browser homepage was google and I started typing in the
location bar immediately after loading the browser and before Google requested
keyboard focus, then the browser should not allow it to steal the focus.

Simple rule: if the user began doing something after the page began loading but
before it finished loading, then the user is deemed to be "busy" and the website
should not be allowed to steal focus. This is exactly what happens if you open a
new window in Windows and shift focus away before it actually pops up. When it
actually pops up, its focus request will be rejected and instead you'll get a
flashing indicator in your taskbar. This is exactly the kind of behavior I'm
voting for.