That said, according to that StackOverflow page, the error only appears in DevTools. That's not as bad as it sounded at first. I was worried it would be an IE-style alert on page load, for example, or a visible bar across the top of the page. It's not, it's just spam in the DevTools console.
That's correct. I posted that answer on StackOverflow, and as far as I can tell from testing so far, it is just a warning in the DevTools console as noted on the StackOverflow answer, and there shouldn't be any other negative impact :)