Some browser games e.g. using Unity engine show in 3D with aliased lines drawing. I wish Firefox could add antialising to those html5 content as post processing.
It can be done on GPU using pixel shader like FXAA. Or Firefox could expose itself to the graphics driver as 3D rendering, so user can add FXAA post processing in graphics driver. (Same with graphics driver image sharpening post processing)
e.g. https://www.desura.com/pill-soccer.html