Activate the title bar in Mozilla Thunderbird 17 again

Starting with the Mozilla Thunderbird 17, the classic title bar has been hidden in Thunderbird. To get the classic title bar back, follow these steps:

1. Start Mozilla Thunderbird.
2. Open the config editor by clicking on Tools -> Options -> Advanced -> General -> Config Editor (button)
3. Navigate to the setting “mail.tabs.drawInTitlebar” in the config editor and set it to “false” by double clicking on the line.
4. Close the config editor and restart Thunderbird

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