3 of those are preinstalled on devices by their corporate owners (Safari is literally imposed on all iOS users). Opera today is really a VPN/proxy/bandwidth opt

3 of those are preinstalled on devices by their corporate owners (Safari is literally imposed on all iOS users). Opera today is really a VPN/proxy/bandwidth optimiser for bandwidth-poor Asian markets, and iirc is government-mandated in some cases. Firefox can do better for sure, but its competitors basically cheat.