Just the fact you're on HN means that you're in a small percentage of users, and anyone doing pair programming or many related activities will also fit into a s

Just the fact you're on HN means that you're in a small percentage of users, and anyone doing pair programming or many related activities will also fit into a small subset of overall Firefox users. The vast majority of users will start with IE (now with Edge) or Safari, and will be exposed to Chrome when they go to Google for a search or because they have an Android phone and got directed there. I'd say that the best thing that could happen for Firefox would be Google banning ad blockers, but in my experience with end users in office environments most users don't realize they even exist. Similarly they could partner with Facebook or some major destination sites, but that would have its own issues and complications.