/* Multi-Row Bookmarks Toolbar */
#PersonalToolbar {
max-height: none !important;
}

#PlacesToolbar > hbox {
display: block;
width: 100vw;
}

#PlacesToolbarItems {
display: flex;
flex-wrap: wrap;
}

/* Auto-Hide Bookmarks Toolbar */
#PersonalToolbar:not([customizing="true"]) {
transform: translateY(-500px);
transition: transform 0s ease 200ms !important;
position: absolute !important;
z-index: 1;
display: block;
width: 100% !important;
}

#navigator-toolbox:hover > #PersonalToolbar:not([customizing="true"]) {
transform: translateY(0px);
transition: transform 0s !important;
}


ブックマークツールバーは↑これ便利だよ。複数行とオートハイドね