You can go to

https://myaccount.google.com/permissions?continue=https://my...

And disable Google Account Sign In prompts

I use several extensions that allow you to explicitly approve certain features or give permission to run JavaScript.

Out of the top of my head: NoScript, Trace [0], uBlock origin, Decentraleyes, Privacy badger.

As well as using a pi-hole.

[0] https://addons.mozilla.org/en-US/firefox/addon/absolutedoubl...