You've also changed the font, right? Somehow I can't even reproduce the old bad look by changing to Fira :-) Anyway the new look is great, thank you! My only remaining nit is that
Yeah, the body text is in Source Sans Pro now (seems to be more consistent across platforms[1]).
Good point about the heading weight. In the grey theme the heavy headings don't fit… I'll have to play around with different weights.
[1] "Consistent", I say, and yet I still had to specify that Firefox on Windows (yes, specifically Firefox and specifically on Windows) should get a different weight… fonts, man…
Might as well go with a bang.