I'm on a 6-week old Framework Laptop running Windows 11 (23H2) with Thunderbird 128.3.3esr (64-bit.) The email account is connected via IMAP, no issues sending and receiving. When I open an email and click the little gray 'person' icon to the right of an email address, it does nothing. It just kind of blinks gray as I click it, but does not add the address to my address book as I would expect. Aside from that, it appears that the address book is functioning properly outside of this issue. I was not able to find joy in any of the relevant settings and preferences within Thunderbird. My old computer has Thunderbird and Windows 10. On that one, I can open an email and click the same little gray "Save this address in the address book" icon from within any email, and it adds it to my address book and turns the gray icon blue as expected. I even tested on a separate physical machine and the desired operation was experienced. It's only my new laptop that is malfunctioning. Any ideas? I don't yet want to uninstall and re-install Thunderbird since my IMAP mail folders are plentiful and not small. Furthermore, I'm not ready to wipe the laptop and start fresh, since it's only 6 weeks old and has no spyware/malware...