That's because when you try to log into one of those, it tries to simultaneously log you into the other domains/Google products linked to your account and per-domain sandboxing prevents that.
My setup against tracking is as follows:
- Temporary Containers: Prevent cookie-based tracking
- ClearURLs: Prevent URL-based tracking, which Google and Amazon use everywhere
- VPN: Prevent IP-based tracking, to some degree
- uBlock Origin: Block adds and some nasty JavaScript
I find it quite hard to prevent fingerprinting. The privacy.resistFingerprinting in Firefox breaks tons of things. So does blocking JavaScript. And uMatrix is a bit time consuming to use, and not suited for inexperienced users.
Any alternatives considering aside from Tor Browser?