When quitting Thunderbird, visible tabs will be saved and will be restored when you open Thunderbird the next time. There is also a Tab menu on the Tab toolbar to help you switch between Tabs.
在退出 Thunderbird 时，可见的标签页将被保存，并且将在您下次打开 Thunderbird 时恢复。标签工具栏上还有一个“标签页”菜单，可以助您在标签页之间切换。