> Chrome solved this a decade ago... just keep shrinking the tabs down to Favicon size or smaller. Safari just added Favicon images last year, and I don't even think they're visible by default.

Don't give them too much credit. For a very long time, the minimum size for chrome tabs resulted in them hiding the favicon, becoming a completely useless row of triangles. And to add insult to injury, the tabs were still big enough to show favicons if they wanted to.