[yohui]

Currently, it seems only the first three plus phishing/malware protection are enabled by default. The phishing/malware protection is also used by Firefox's "Safe Browsing" feature: Firefox uses a local blocklist to check for potentially malicious sites, so you only connect to Google to update the blocklist and double-check when you actually run into a site on the blocklist; Chrome does the same.

See: https://support.mozilla.org/en-US/kb/how-does-phishing-and-m...

Prefetch makes local predictions and connects to any site, not Google in particular AFAIK.

The omnibar prediction service uses your default search engine, so Google is only involved if you've left it as such.

So if you take the obvious steps of changing your search engine and signing out of Google, that leaves only the navigation error service. As with safe browsing, this appears to send URLs to Google only if certain local conditions are met.