Solution was the scroll all the way down past the (long list) of contributing clients. At the very bottom was the URL that was generating the traffic, ftp.mozilla.org. Drilling down too far, (clicking on any of the clients itself) does not show the URL that's being reported as Mozilla. After research, turns out one of our tools had an update that caused it to generate unnecessary amounts of traffic, for an unneeded product. All good!
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