I very occasionally run into these, and keep Chrome as a backup browser. I suspect it's as often to do with adblocking though - I have no content blockers on Chrome.

Firefox performs way better and is a more pleasant experience. (This is a fair comparison because my ad-laden Chrome experience is internet as Google intends!)

Is your firefox rendering google maps the same sharp (vectorized) as in chromium? In my firefox it seems not so sharp and rasterized (tiles?), but might be related to some privacy plugins/settings I'm using.

I didn't compare or realize that. So if you are right and most probably you are, I suppose I am not that interested in that sharpness.