Mozilla also further clarified why it used certain terms, saying that the term “nonexclusive” was used to indicate that Mozilla doesn’t want an exclusive license to user data, because users should be able to do other things with that data, too.
“Royalty-free” was used because Firefox is free and neither Mozilla nor the user should owe each other money in exchange for handling the data in order to provide the browser. And “worldwide” was used because Firefox is available worldwide and provides access to the global internet.