Even better, the keyboard shortcut Alt+Shift+U will bring up the view source page in Firefox. Click "Add", then select the feature you want to trigger, and then add the keyboard shortcut you want to use.
Another great example is Gmail, where you can enable shortcuts (settings -> general -> enable shortcuts) and then use a keyboard shortcut to see a list of keyboard shortcuts! All of this is just grazing the surface of the keyboard shortcut iceberg...
Don't forget, backspace is the keyboard shortcut for your browser's back button. Oh wait, you wanted the keyboard shortcut? Continuing to tweak the user experience, keyboard shortcuts and a cute blue arrow were added to results pages.
After all, there's nothing really neat or new about the implementation you described—the find feature on practically every Microsoft application works pretty much the same way, right down to the CTRL+F keyboard shortcut.
Greg's elegant solution: Use the "close window" keyboard shortcut, the Control-W command. Though it takes a bit of practice, using the close window command will become as automatic as using the copy, paste and delete keyboard shortcuts.
