The King and Queen primarily lived in the Buckingham palace, and not Windsor Castle. In fact, Churchill asked the King to be safe in that castle [much more away from Germany and the castle was good enough to withstand bombs of that era], but the King refused. read more
So again, you are right to ask whether the US used firebombs, and again, the answer is a "Yes, but not like the British did!" The composition certainly reflects the intended mission roles and the belief in precision bombing, if we can call it that, versus the very dedicated area bombing of the British. read more