Oh my god. Thank you for this great news. I was almost resigned to see Thunderbird being sunset. It's an amazing client and will only become better by utilising the progress made by Firefox.
Agreed! I just donated cash money, as I'd hate for it to go away.
Consider setting up a small monthly donation, as this helps nonprofits plan better and be more sustainable
I'm pretty thrilled as well. I upgraded Thunderbird to 58beta and it is pretty nice. The visual refresh is welcome and it feels like TB maybe has benefited from some of Firefox's under-the-hood improvements since 52.
I've been using Apple's Mail.app for a long time, but it's nice to see Thunderbird as a real alternative to it or Outlook.