Firefox has rough, non-antialised fonts. Anybody knows how to correct?

[Yuri]

For some reason firefox-42.0 has non-antialiased fonts, at least some of 
them, and this makes it look poor. Comparing to chrome where fonts look 
much better.

I also heard complaints from some other FreeBSD users that fonts 
generally look noticeably worse than in Arch out of the box, though I 
didn't notice this myself.

Anybody knows what is the reason of this Firefox font issue?

Yuri