You don't own Firefox. You have a license to use it. Background network traffic is not a big deal. Ignoring downloading important updates the bandwidth the requests use is not significant. In such a large and complex piece of software as a web browser I do not understand why traffic should be associated with UI interactions. How is the browser supposed to show a notification when someone tweets? Would you prefer to hit a "Check for Notifications" button or would you prefer to just get a notification. The latter option has a million times better UX.
You don't own Firefox. You have a license to use it. Background network traffic is not a big deal. Ignoring downloading important updates the bandwidth the requests use is not significant. In such a large and complex piece of software as a web browser I do not understand why traffic should be associated with UI interactions. How is the browser supposed to show a notification when someone tweets? Would you prefer to hit a "Check for Notifications" button or would you prefer to just get a notification. The latter option has a million times better UX.