We're experiencing some issues with site build system and trying to get 115 into your hands. It wouldn't be a major release without some hiccups! Thanks for your patience folks.
@thunderbird I've already gotten my hands on #Thunderbird 115 #Supernova and I can tell you: it's worth the wait 💙! The team has done a terrific job of making frontend and backend improvements while maintaining and even extending customizability 👏!
Mind you that the #Cardbook add-on hasn't been updated yet to be compatible with this release. You can use the built-in contacts manager however. Maybe now is the perfect time to back-up your contacts (export to .vcf files) and TB profile?