As a chrome-user: this. Firefox lost me years ago due to performance differences, and since chrome works fine for me, there was no ux-related reason to switch back. The day I'll see ads everywhere will be the day I'm back to firefox, and without second thoughts at that. If I really like your service, I'll happily pay for it. I hate ads, the psychological strats behind them are completely unacceptable. I'd happily pay google a subscription-rate, if that's what it takes tbh. Take my money, not my attention.