It looks good for me in Firefox on Xubuntu 16.04.

It's legible in my computer. Debian 8, with Firefox, no-script, and ublocker, with 24" screen and a forced minimum font size of something that I don't even remember.

Anything of those could be making it legible. I'd rather trust the opinion of somebody with a more standard system, and I doubt the GP is that somebody either.

Looks good in Firefox on Windows. I'm not on a high DPI monitor, which can certainly mess things up.

Taking a screenshot and zooming in with a pixel grid, the 'i' on comedian is antialiased to 3 pixels in total wide, though the 2 on the side are very light. Firefox is 2 pixels wide, but both columns are dark. Chrome is also 2 pixels wide, but the columns are rather lightly colored.

(Windows' native font antialiasing is amazing, I'm sad all apps don't use it...)