Thunderbird releases 115 'Supernova', with an overhaul to their design and functionality
Our Fastest, Most Beautiful Release Ever: Thunderbird 115 "Supernova" Is Here!
https://blog.thunderbird.net/2023/07/our-fastest-most-beautiful-release-ever-thunderbird-115-supernova-is-here/
More than just a yearly release, Supernova is a modernized overhaul of Thunderbird, but still feels comfortable and familiar.