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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 number
by classichasclass 9y ago
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.