Supernova substantially improves Thunderbird’s keyboard navigation and screen reader accessibility across the           entire application. We’ve also greatly expanded the ability to navigate Mail content and buttons using the TAB and           arrow keys.
Supernova 大幅改进了整个 Thunderbird 应用程序的键盘操作和屏幕阅读器。我们还着力增强了使用 Tab 键和方向键来选择邮件内容和按钮的功能。