As title says, Firefox trying to connect to aus5.mozilla.org at startup and I cannot stop it from doing so. I have seen the answer to other question here [[Knowledge Base Article|What is the purpose of Firefox connections to "aus5.mozilla.org" and "shavar.services.mozilla.com"]] which the selected answer is not correct. I have changed both following settings to http://localhost browser.safebrowsing.provider.mozilla.gethashURL browser.safebrowsing.provider.mozilla.updateURL the address in question is not in about:config since I have changed every instance of data that even remotely looks like a web ULR to localhost