I really can't agree - one major area is CSS 3D transforms. Firefox recently broke stacking order (again) context in 3D in the 49 release, and continues to have

I really can't agree - one major area is CSS 3D transforms. Firefox recently broke stacking order (again) context in 3D in the 49 release, and continues to have very poor aliasing artifacts. Chrome/Safari/Edge have pretty solid implementations. Here's just one of the many bugs filed on the topic: https://bugzilla.mozilla.org/show_bug.cgi?id=1187209 https://bugzilla.mozilla.org/show_bug.cgi?id=1187209. Firefox can have major (breaking) paint bugs filed and have "Status: NEW" for basically an entire year.