If the urlbar's input field is in focus and a contextual tip is present, then the tip's button should be blue. If the urlbar's input field is _not_ in focus and a contextual tip is present, then the tip's button should be grey.
Bug 1573321 Comment 0 Edit History
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If the contextual tip is present and the user arrows up/down to the tip then its button should be selected (so that clicking Enter would click the button)