Seleziona, copia e incolla questo codice nel file userChrome.css che hai creato.
/*AGENT_SHEET*/
/* Firefox 57+ userChrome.css tweaks ****************************************************/
/* code mostly taken from 'Classic Theme Restorer' & 'Classic Toolbar Buttons' add-ons **/
/* by Aris (aris-addons@gmx.net)*********************************************************/
/* Github: https://github.com/aris-t2/customcssforfx ************************************/
/****************************************************************************************/
#personal-bookmarks {
display: block;
}
#personal-bookmarks #PlacesToolbar {
display: block;
min-height: 0px;
overflow-x: hidden;
overflow-y: auto;
max-height: 999px;
}
#personal-bookmarks #PlacesToolbar > hbox {
display: -moz-stack !important;
left: 0px;
right: 0px;
width: 100%;
}
#personal-bookmarks #PlacesToolbar #PlacesToolbarItems {
overflow-x: visible;
overflow-y: visible;
}
#personal-bookmarks #PlacesToolbar #PlacesToolbarItems > box {
display: block;
}
#personal-bookmarks #PlacesToolbar > .bookmark-item{
visibility: visible !important;
}
#personal-bookmarks #PlacesToolbar .chevron{
display: none;
}
#personal-bookmarks #PlacesToolbar > hbox > hbox{
overflow-x: hidden;
overflow-y: hidden;
}
#personal-bookmarks #PlacesToolbar #PlacesToolbarDropIndicator[collapsed="true"],
#personal-bookmarks #PlacesToolbar #PlacesToolbarDropIndicator{
display: none;
}
#personal-bookmarks #PlacesToolbar toolbarbutton.bookmark-item{
padding-top: 2px;
padding-bottom: 2px;
/*margin-left: -4px !important;
padding-right: 9.5px !important;*/
}
#personal-bookmarks #PlacesToolbar toolbarbutton.bookmark-item:hover:active:not([disabled="true"]),
#personal-bookmarks #PlacesToolbar toolbarbutton.bookmark-item[open="true"] {
padding-top: 2px !important;
padding-bottom: 2px !important;
/*-moz-padding-start: 4px;
-moz-padding-end: 2px;*/
}
#personal-bookmarks #PlacesToolbar toolbarseparator{
-moz-appearance: none !important;
visibility: visible !important;
display: inline;
text-shadow: none !important;
border-left: 3px solid ThreeDShadow !important;
border-right: 3px solid ThreeDHighlight !important;
vertical-align: middle;
}
#personal-bookmarks toolbarbutton.bookmark-item[dragover][open]{
-moz-appearance: toolbarbutton;
}
#navigator-toolbox toolbar:not(#nav-bar):not(#toolbar-menubar):not(#TabsToolbar) {
max-height: 999px !important;
}