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I’ve been on macOS (OS X) for over a decade, never used Safari as the default browser, and have no idea what you’re referring to.

Ditto, and I get them occasionally.

I may have found what you’re referring to and how to disable it[1][2].

That’s interesting, I switched to Chrome months ago and haven’t seen any — even though I might open Safari from time to time.

I have been on MacOS for a few years now and I have never received a notification about safari.