[profile folder]\chrome\BookmarksToolbar.svg 
 /* Specify icon to override basic folder   */
 list-style-image: url("BookmarksToolbar.svg") !important; } 

.bookmark-item[container], treechildren::-moz-tree-image(container) { fill: Blue    !important; }

Only able to color SVG files in omni.ja NOT SVG files extracted from omni.ja and saved to a local directory BookmarksToolbar.svg is in the chrome directory along with userChrome.css. See code below <per> /* Colored folders for Bookmark Menus. */ /* Standard folder -- on Toolbar and Menus */ #PlacesToolbarItems toolbarbutton[container="true"]:not([query="true"]) .toolbarbutton-icon, :-moz-any( #PlacesToolbarItems, #PlacesChevronPopup, #BMB_bookmarksPopup, #bookmarksMenu, #OtherBookmarksPopup) menu[container="true"]:not([query="true"]) > .menu-iconic-left > .menu-iconic-icon, /* Standard folder -- in Sidebar, Library, Add/Edit Bookmark dialog */ :-moz-any( #bookmarks-view, #editBMPanel_folderTree, #placesList, #placeContent) treechildren::-moz-tree-image(container), #editBMPanel_folderMenuList > .menulist-label-box > .menulist-icon, #editBMPanel_folderMenuList menupopup menuitem, #editBMPanel_folderMenuList { [profile folder]\chrome\BookmarksToolbar.svg /* Specify icon to override basic folder */ list-style-image: url("BookmarksToolbar.svg") !important; } /* One line fix This colours all bookmarks */ .bookmark-item[container], treechildren::-moz-tree-image(container) { fill: Blue !important; } /* Make Shop folder Red */ toolbarbutton.bookmark-item[label="Shop"] > .toolbarbutton-icon { fill: #e74c3c !important; } /* Make Active folder Green */ toolbarbutton.bookmark-item[label="Active"] > .toolbarbutton-icon { fill: #3CE770 !important; } <per>