It's time to explain Thunderbird's relationship to Mozilla again.
Thunderbird is in its own legal entity - MZLA Technologies and is governed in part by a Community Council elected by and from our open source contributors.
Thunderbird is currently 100% donation-funded. We do not receive any money outside what our donors give us.
This is good for Thunderbird and makes us unique. Our whole structure only works to serve the interests of our users and contributor community.