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REALLY Solved now, via upgrade to NIS 22: Endlessly-Repeating Entries in Firewall History
Something I like about NIS 22 (in addition to the fact that the tray icon becomes “transparent” to indicate Quiet Mode is on) :
As you can see from what I marked as the "solution" in the thread below, it wasn’t *really* a solution, but instead more of an acknowledgement. But I am glad to see that with the NIS upgrade to version 22, my history is no longer overrun by a continually-repeating pair of Smart Firewall entries caused by one of my legitimate background programs. Those entries no longer appear, period.