From the new terms:
When you upload or input information through Firefox, you hereby grant us a nonexclusive, royalty-free, worldwide license to use that information to help you navigate, experience, and interact with online content as you indicate with your use of Firefox.
It’s just a lousy, metaphorical title. The real Firefox killer already exists, and its name is Chrome. I didn’t mean to imply something about your expectations for Ladybird, my bad.