If you're going to make that kind of complaint, you really should at least mention what you're using to view the page.

I agree. Edited my comment.

People who have retina screens tend to forget that most of the world still doesn't have retina screens.

I suppose you're talking about the "Roboto" font in #737373. It's also hard to read with Chrome on Windows 7 and a standard 1920x1200 monitor. The same thing happened when Google Fi launched. Either they don't test enough on certain platforms or it's just that corporate design takes precedence over good readability on certain platforms.

Yeah, not sure why it has font weight of 100.

I guess that it is a "Firefox issue". I have the same problem with Firefox under Windows 7 (2560x1440, newly calibrated screen). The font renders a little better in Chrome and in IE 11 it looks good.