>I do not know if this is true, but it is what I have heard.
Firefox preferences -> security -> block dangerous and ... If this setting is
marked, any url you watch is send to google, because google verifies with
their url list. Google likely keeps the data. I do not know if google pays
mozilla for the data.
True, it is called "safe browsing".
Here, the relevant about:config settings in seamonkey (ff)
user_pref("browser.safebrowsing.controlledAccess.infoURL", "");
user_pref("browser.safebrowsing.downloads.enabled", false);
user_pref("browser.safebrowsing.downloads.remote.block_dangerous", false);
user_pref("browser.safebrowsing.downloads.remote.block_dangerous_host",
false);
user_pref("browser.safebrowsing.downloads.remote.enabled", false);
user_pref("browser.safebrowsing.downloads.remote.url", "");
user_pref("browser.safebrowsing.enabled", false);
user_pref("browser.safebrowsing.gethashURL", "");
user_pref("browser.safebrowsing.id", "");
user_pref("browser.safebrowsing.keyURL", "");
user_pref("browser.safebrowsing.malware.enabled", false);
user_pref("browser.safebrowsing.malware.reportURL", "");
user_pref("browser.safebrowsing.phishing.enabled", false);
user_pref("browser.safebrowsing.provider.google.gethashURL", "");
user_pref("browser.safebrowsing.provider.google.lists", "");
user_pref("browser.safebrowsing.provider.google.pver", "");
user_pref("browser.safebrowsing.provider.google.reportURL", "");
user_pref("browser.safebrowsing.provider.google.updateURL", "");
user_pref("browser.safebrowsing.provider.google4.gethashURL", "");
user_pref("browser.safebrowsing.provider.google4.lists", "");
user_pref("browser.safebrowsing.provider.google4.pver", "");
user_pref("browser.safebrowsing.provider.google4.reportURL", "");
user_pref("browser.safebrowsing.provider.google4.updateURL", "");
user_pref("browser.safebrowsing.provider.mozilla.gethashURL", "");
user_pref("browser.safebrowsing.provider.mozilla.lists", "");
user_pref("browser.safebrowsing.provider.mozilla.updateURL", "");
user_pref("browser.safebrowsing.reportErrorURL", "");
user_pref("browser.safebrowsing.reportGenericURL", "");
user_pref("browser.safebrowsing.reportMalwareErrorURL", "");
user_pref("browser.safebrowsing.reportMalwareMistakeURL", "");
user_pref("browser.safebrowsing.reportMalwareURL", "");
user_pref("browser.safebrowsing.reportPhishMistakeURL", "");
user_pref("browser.safebrowsing.reportPhishURL", "");
user_pref("browser.safebrowsing.reportURL", "");
user_pref("browser.safebrowsing.updateURL", "");
user_pref("browser.safebrowsing.warning.infoURL", "");
What about firefox and thunderbird addons?
Well, they are software. If they were written to spy on you...
You should keep them minimal, less is more. I have only 3 installed,
noscript, ublock origin, httpseverywhere, you don't need more..
cheers