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Yup, it's terrible (Firefox 42 / Windows 8.1).

Gathering from what I've seen on the comments, it seems to be a windows-specific issue.

Can you provide a screenshot and what browser/OS you're running?

I'll look into it.

Looks pretty bad on my end too, Firefox on Windows 7 64bit.

Same even with OSX, which to me is usually quite a bit easier to read.

nope, it's pretty bad for me too. w10 with default display everything.