I'd like to see more effective anti-fingerprinting. I know it's just an arms race though.

It's almost like one of the leading browser developers is also in the advertising business. (To be clear I completely agree, fingerprinting is evil.)

Presumably better spoofing, so the websites can't tell from obvious tells like resolution.

Firefox on Android seems pretty good on desktop-mode, though: its resolution seems desktop-like, and sites rarely give me the mobile treatment.