Hi Howard, Mozilla doesn't have a paid subscription for the Firefox browser. Do you mean one of these free services: * If you want to cancel an email newsletter, there should be instructions at the bottom of the message, or go to your Firefox Account page at https://accounts.firefox.com/. * If you no longer want to receive breach alerts from Firefox Monitor, you can go to the Monitor site to change your settings: https://monitor.firefox.com/user/dashboard If you have a paid add-on service subscription, is it for Firefox Relay, Firefox Private Network, or Mozilla VPN? Each of those would have different steps to cancel.