#main-window:not([drawtitle="true"]):not([inFullscreen="true"])#nav-bar{margin-left:30px;/* leftTop drag area */border-right:140pxsolidvar(--toolbar-bgcolor);}:root[sizemode="maximized"]#nav-bar{margin-top:20px!important;/* Top drag area */margin-left:0px!important;/* hidden leftTop drag area in Fullscreen mode*/border-right:140pxsolidvar(--toolbar-bgcolor);}:root[privatebrowsingmode="temporary"]#nav-bar{border-right:180pxsolidvar(--toolbar-bgcolor)!important;}/* 主要是修改这里的 margin-bottom 支持负数 例如 margin-bottom: -30px !important; */#titlebar{margin-bottom:-0px!important;}/* move down 3 button on rightTop */.titlebar-buttonbox-container{margin-bottom:-5px!important;}:root[sizemode="maximized"].titlebar-buttonbox-container{margin-bottom:-15px!important;}/* move down private icon */.private-browsing-indicator{margin-bottom:-8px!important;}:root[sizemode="maximized"].private-browsing-indicator{margin-bottom:-18px!important;}/* hidden horizontal tabbar on top */#tabbrowser-tabs[orient="horizontal"]{visibility:collapse!important;}#sidebar-box[sidebarcommand="_0ad88674-2b41-4cfb-99e3-e206c74a0076_-sidebar-action"]sidebarheader{visibility:collapse!important;}