Thunderbird is the leading free and open-source email, calendaring, newsfeed, and chat client with more than 20 million active monthly users across Windows, macOS, and Linux. One of Thunderbird's core principles is the use and promotion of open and decentralized standards.
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i wonder for the reason to have to two large whitespaces for two tool bars when all of it easily could be one. will there be more icons in that first toolbar in the near future? or will there a more menues in the second toolbar anytime soon? or is it adspace?
the title bar is traditionally not a toolbar, and that first toolbar is typically not visible unless you press Alt. Thunderbird has looked like this for the past 20 years, because all other programs used to too.