Things you should know:
Information we collect
Firefox Account Information. This service requires a Firefox Account, which sends FPN your email address, locale, and IP address. Learn more about Firefox Account data practices.
Location information. Firefox FPN receives your IP address from your Firefox Account when you sign up for and use the service. We use the IP address in order to approximate your location because FPN is currently only available in the United States.
Technical data. Mozilla receives basic information from FPN about your mobile and desktop app version and device, including device operating system and hardware configuration. When FPN sends data to us, your IP address is temporarily collected as part of our server logs.
Interaction data. Mozilla receives data about your interactions with FPN, such as when you enable and disable the proxy and the amount of bandwidth you use when the proxy is enabled.
Read the technical and interaction data collection documentation here. We use the data we collect to improve performance and stability for our users, and to measure FPN’s performance.