userChrome.css 自行搜索怎么用
#PersonalToolbar { border-top: 1px solid var(--toolbox-border-bottom-color) !important; border-bottom: 1px solid var(--toolbox-border-bottom-color) !important; height: 20px !important; opacity: 0 !important; position: fixed !important; visibility: hidden !important; width: 100% !important; }
#nav-bar:hover ~ #PersonalToolbar,#PersonalToolbar:hover { opacity: 1 !important; visibility: visible !important; }
