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Was it? It wasn't removed for me. You can add it again with Right click anywhere on the toolbar -> Customize

• Silhouette 6y ago
  You should be able to do that, and it was the first thing I tried when it was removed by default. Unfortunately, it didn't work for me then, and having just checked again, it still doesn't work now (I'm on 68 for now, as the 78 update isn't being pushed to the regular release channel for me yet). Edit: Apparently I was wrong and the replacement "Smart Reply" button does show up, but only sometimes depending on context. Since Thunderbird only shows it selectively now, I did not see that when I was checking before. So I withdraw my criticism about removing functionality, and I replace it with criticism of changing user settings during updates, replacing a well-established feature with a subtly different one, and hiding controls that are currently not applicable rather than showing them as disabled. The fact that this comment thread exists is a pretty good demonstration of why these are bad ideas.