@kitwar Maybe, but I doubt it, given that I have blocked third-party cookies, chose settings to delete all cookies and history when I close the browser, and installed uBlock Origin, HTTPS Everywhere, and Privacy Badger. I just checked my cookies and the only ones present are from this session. It's probably fingerprinting, given that I do not listen to popular music and my DSL ISP gives IP addresses within a narrow range.
Thanks for the response, stng. I should have mentioned that this is a new installation of 12.17 with a new user (me). I will investigate the zoom default, as that sounds like a solution. I like how you described 12.17 as the "real Opera."