As I mentioned in another comment, Mozilla stopped developing updates back in 2012 and passed it to the community. I imagine the maintenance will move likewise.

As I mentioned in another comment, Mozilla stopped developing updates back in 2012 and passed it to the community. I imagine the maintenance will move likewise. If you're upset about decisions that have been made with Thunderbird, submit a pull request. Here's the code: https://hg.mozilla.org/comm-central https://hg.mozilla.org/comm-central