>This is because since their core functionality is so similar, small advantages will tip the scales.
It is a a bold assertion, which is not backed up by the data. Despite Mozilla repositioning Firefox recently and reclaiming some lost ground, it is to a larger extent, still only maintaining a steady set of core users. To make an assumption that small advantages will tip the scales in favour of FF is wishful thinking, as demonstrated by some of the conversations. Furthermore, it is inherently not in the best interests of Google to actively promote ad-blocking policy unless it serves it's own purpose, coupled with the acute awareness of why power users and developers pick Chrome ─ they are well positioned to throttle any competition.
https://data.firefox.com/dashboard/user-activity