Safe Browsing DOES NOT reveal URLs to Google. See https://en.wikipedia.org/wiki/Google_Safe_Browsing#Privacy and read the protocol spec or Firefox source code if you doubt this.
> Google Location Services, which sends your WiFi router SSID, SSIDs of routers in range, and hardware details, to Google. This is less clear cut as Mozilla's use of this service has been on-off over time, and varies per device.
Mozilla has made a significant investment to try to get away from this by building the Mozilla Location Service. In the meantime it's a straight tradeoff between quality of user experience and information leakage. Experience shows that degrading the user experience for some invisible and small privacy benefit is not a winning strategy.