CSS Nesting is Here!
CSS Nesting support finally landed on Firefox last month.
Heard about it on this episode of syntax.fm: CSS Nesting is Here! — Syntax Podcast 665.
See the reference on MDN: Using CSS nesting - CSS: Cascading Style Sheets | MDN.
I can mostly skip using SASS now (I did the styles for the resume page with just plain CSS). The Jekyll theme that I copied for this site uses SASS though (well, I guess that would be most any Jekyll site, since it has SASS support built-in). Someday I might de-SASSify it.