Thing is, those devices and apps can add up–until your Firefox cloud account could become a security risk. What happens if you’ve lost a device or no longer use a service? Or what happens if a service you do use was breached? What do you do?
One thing you can do is to disconnect lost, stolen, or unused devices and revoke the permissions of extraneous apps and services. Fortunately, the developers of Firefox have made this incredibly easy to do. However, it’s on you to make sure to manage this task on a regular basis, otherwise you never know what might befall that cloud data.