How can I make Firefox recognise that I have changed the DNS servers to use?

After I edit /etc/resolv.conf to make my computer use more reliable DNS servers, Firefox doesn't notice until I restart it. How can I make Firefox notice the change without restarting it?

I discovered that I can do this by ticking Work Offline in the File menu, and then immediately unticking it again.
(I believe this mimics what would happen if the operating system disconnected and reconnected from a wireless network, which would be a situation where Firefox would need to check for new DNS servers. So that explains why it works.)

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