Ich verwende einen kürzeren Code als Boersenfeger, da ich nicht so viel ausblende, und der funktioniert:
CSS
		
					
				@-moz-document url("chrome://browser/content/places/bookmarksSidebar.xul"),
url("chrome://browser/content/browser.xhtml") {
#menu_bookmarksSidebar {
     display: block !important;
      }
/*.sidebar-placesTreechildren[bookmarks-view]*/
#bookmarks-view-children {
      margin-top: -120px !important;
      margin-left: -15px !important;
      }
sidebarheader {
      display: none !important;
      }
/*#sidebar-search-container {
      display: none !important;
      }*/
.sidebar-placesTreechildren::-moz-tree-separator {
      margin: 0px 500px !important;
      }
label[persist="value"][flex="1"][crop="end"][control="sidebar"][value="Zapołožki"] {
      display: none !important;
      }
#sidebar-box {
    display: block !important;    
    position: fixed !important;
    top: 116px;
    bottom: -35px;
    width: 0px !important;
    overflow-x: hidden !important;
    -moz-appearance: none !important;
    border: 1px solid transparent !important;
    border-left: 0 !important;
    opacity: 0 !important;
    transition: width .2s ease-out .2s, opacity .2s ease-out .2s !important;
    z-index: 2 !important;
     }
#sidebar-box:hover {
    width: 230px !important; 
    opacity: 1 !important;
    transition: width .2s ease-out .2s, opacity .2s ease-out .2s !important;
     }
#sidebar-splitter {
     display: none !important;
     }
#sidebar-header {
     width:100%;
     border: 0 !important;
     }
#sidebar {
     display: block !important;
     width: 100%!important;
     height:95%;
     }
/* Lesezeichensidebar Icon-Abstand zur linken Seite */
    
    .sidebar-placesTreechildren[view="bookmarks-view"] {
    margin-left: -10px !important;
    }
/* Lesezeichensidebar Icon-Abstand */
    #bookmarks-view-children:-moz-tree-image{
    margin-right: 5px !important;}
    
/* Suchsymbol in der Sidebar ausblenden */
    .textbox-search-sign{
    display:none !important;
    }
    #sidebar-search-container textbox input.textbox-input::-moz-placeholder {
    color: transparent !important;      
    }
    
/* Suchleiste Schrift-Größe einstellen */
    .sidebar-placesTreechildren,sidebarheader,#sidebar-search-label,#search-box{
    font-size: 16px !important;
    color: maroon !important;    
    }
    
/*Suchfeld in Chronik Sidebar entfernen */
 
    sidebarheader, #history-Panel > hbox { display: none !important; }
    
    #content tab:not([selected="true"]) {
    opacity: 0.9 !important;
    }
    #urlbar .autocomplete-history-dropmarker {
    margin-left: -14px !important;
    }
    
/*Hintergrundfarbe Sidebar*/
    #sidebar{
    background: blue !important;
        opacity: 1 !important;
     }
     
    .sidebar-placesTreechildren {
    color: white !important;
    }
.button-text[value="Napohlad"] {
color: white !important;
font-weight: 600 !important;
}
.button-menu-dropmarker[label="Napohlad"] {
color: white !important;
}   
 
.popup-internal-box > menuitem[type="checkbox"]  {
color: red !important;
}
/* Lesezeichenordner Sidebar */
    @-moz-document url("chrome://browser/content/places/bookmarksSidebar.xul") {
    treechildren::-moz-tree-image(container) {
    list-style-image: url("data:image/png;base64,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") !important;}
        }
  }
	
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