50GB is a lot of free data. ~~And if it's actually still from Mullvad like before, maybe not a bad deal.~~ (Edit: it's not from Mullvad.) Mozilla already bakes it halfway into their Containers extension, so maybe they can keep it as an extension this time.
Less thrilling is a whole new ~~AI~~ "Smart" window type that's basically just an AI sidebar that's no longer in the sidebar. Again, why not an extension?