Safe Browsing (except for downloads) is handled by downloading a list of blacklisted sites (that's what the 15MB urlclassifier database in your profile is for).

Safe Browsing (except for downloads) is handled by downloading a list of blacklisted sites (that's what the 15MB urlclassifier database in your profile is for). Unlike some other browsers, Firefox doesn't send every pageview to Google for analysis. Edit: Since I last read the API documentation, a lookup API has also been added; Firefox does use this API, but only to avoid false positives: https://developers.google.com/safe-browsing/ https://developers.google.com/safe-browsing/ https://support.mozilla.org/en-US/kb/how-does-phishing-and-malware-protection-work#w_what-information-is-sent-to-mozilla-or-its-partners-when-phishing-and-malware-protection-are-enabled https://support.mozilla.org/en-US/kb/how-does-phishing-and-m... And if Firefox is really sending everything I type in my address bar to Google, why am I not seeing any of the benefits (i.e. autocomplete)?