I won't spoof the agent. I want Google to know I'll keep using Firefox no matter what. Except for YouTube, I don't use any other service of theirs, too shitty.
The best way to make them back down is to show we won't bow.
The other day, I finally switched to ProtonMail. I still just forward my gmail inbox for now because I'm too lazy to go through all my accounts and change the email all at once. In due time, I will have switched. Fuck Google.