I've checked various webpages in Firefox Quantum (62.0.3), Chrome (69.0.3497.100) and Edge on Win 10/Macbook setup and haven't seen major differences between them so far. I'll try to write another script that will scroll the same way through some example text in different fonts so we can compare them 1-1 between these browsers, current browsing video is too chaotic to be reliable comparison input.
What's interesting is the fact that every font seems to use some antialiasing stuff, i.e. it isn't just black, but also has some shades on the edges, the bigger the font the wider this shade is. As can be spotted on previous videos - shades equal dithering. And this dithering happens exactly where our eyes try to get focus (at the edges of characters). It may mean that our eye strain may be a result of focusing exactly on things that are constantly changing. I didn't think this shading will be happenning in such extent on retina screen which is quite sharp, but it does.