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by nabeards 3016 days ago
But sad it only goes back to Mac 10.9.
1 comments

Actually I wonder why. Probably using GTK or something that only supports newer systems, but still too bad.
GTK doesn't have anything to do with that; Thunderbird and Firefox use native widgets to implement XUL on macOS. It's mostly a platform decision based on numbers of users and if there are any technical pain points supporting earlier SDKs.