It's important to know that there are a few types of data that, again, potentially could be accessed through Firefox. We divide that data into three categories. The first is what we call technical data. For example, this is data about the operating system that you're using when you use Firefox. The second is what we call interaction data, which is data about how you engage with the browser itself. The third category of data that we identify is web activity data, like the URLs that you browse to or the fact that you visit Facebook.
Our data collection focuses on the first two categories by default. A useful example to keep in mind here is the back button. We collect data from Firefox to understand how people are using the browser, so if you hit the back button, it's useful for us to know that this is something you are using to navigate through the tool. We do not collect data about the page you were on when you hit that button, or the page that you are navigating back to. We want to know how you are experiencing the browser, but not information about the websites and how you are interacting with those websites.