在火狐全屏模式时，工具栏和标签页会在屏幕上部隐藏，只有当鼠标移上去是才显示。
In Firefox’s fullscreen mode, toolbars and the tab strip are hiddenat the top of the screen and only shown on mouseover.
在火狐全屏模式时，工具栏和标签页会在屏幕上部隐藏，只有当鼠标移上去是才显示。
In Firefox’s fullscreen mode, toolbars and the tab strip are hiddenat the top of the screen and only shown on mouseover.
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