Firefox's Enhanced Tracking Protection feature can block Google Analytics and Yahoo Analytics, and many others. By default, the Standard level of protection allows them in Regular windows and blocks them in Private windows. You can switch to Strict or Custom protection to apply blocking in regular windows, too. [[Enhanced Tracking Protection in Firefox for desktop]] ''Note: in recent months, some users with Strict protection enabled have found eBay unusable unless they make an exception for the site. To make an exception for the current site, click the "shield" icon at the left end of the address bar and then click the slider switch on the drop-down panel.''