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Firefox does the same, as I discovered - I don't know whether it's a bug or intended functionality.

(As an aside, I keep HN at 150% and old reddit at 120% - those are the only 2 sites I have permanently zoomed)

Either a bug or an over-eager member of the Mozilla UX team had actually filed a bug with a feature-parity Chrome tag on it in BMO.

Bug-parity. Not even odd parity.

You could say I punted.

It's part of the charm. Unusable on retina without zooming (at least with my eyes).