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Remove referrer meta tag from admin head #2435
It's not clear why this tag was added, and it's even less clear what benefit there would be to keeping it. Its only real function seems to be leaking YOURLS' admin panel location (see #2432), which is not desirable.
A hook (or hooks) will likely be added to let plugins control referrer behavior, by adding the relevant HTTP header(s) and/or meta tag(s). (Separate PR, probably, because exactly what to do is still being defined.)