I can tell from a number of reports available that basically have no resolutions higher than 1920x1200, when we know there are enough retina displays out there that they should be listed.
As to the linked report. It’s hard to discount bias with a browser with 3% market share that looking further seems to be overwhelmingly installed on outdated Windows 8 machines
https://data.firefox.com/dashboard/hardware
> these tables on a cursory Google search are clearly lumping 13 inch MacBook pros into the 1280x800 bucket for instance.
How can you tell that? Even JS-only trackers can use Window.devicePixelRatio to get the real resolution, if needed.