ho risolto con questo codice
/* COLORE DI SFONDO DELLA LIBRERIA - CRONOLOGIA E DOWNLOAD (VISUALIZZA LA CRONOLOGIA) */
/* Searchbox */
#searchFilter {
background-color: #f0f0f4 !important;
background-image: #f0f0f4 !important;
box-shadow: #fdfdff !important;
border-top-color: transparent !important;
color: #000 !important;
}
}
/* Searchbox Focus */
#searchFilter[focused] {
box-shadow: #f0f0f4 !important;
background-color: #f0f0f4 !important;
color: #000 !important;
}
/* All List Colors */
#placesView,
#placesView .scrollbox-innerbox,
#infoPane, #placesList, #font, #placeContent {
-moz-appearance: none !important;
background-color: #fafafa !important;
color: #000 !important;
opacity: 100% !important;
}
/* cronologia (Searchbox) */
#searchFilter {
-moz-appearance: none !important;
background-color: #fdfdff !important;
border: 1px dotted var(--bordercolor) !important;
color: #000 !important;
font-size: 11.5pt !important;
padding: 4px !important;
}
/* download (Searchbox Focus) */
#searchFilter[focused] {
box-shadow: var(--input-field-focus-shadow) !important;
background-color: #fdfdff !important;
border: 1px dotted var(--bordercolor) !important;
color: #000 !important;
font-size: 11.5pt !important;
padding: 4px !important;
}
/* spessore altezza barra strumenti (toolbar spacer) */
#libraryToolbarSpacer {
max-width: 500px !important;
padding: 14px !important;
margin-right: 15px !important;
margin-left: 4px !important;
opacity: 100% !important;
}
/* dimensione pulsanti avanti e indietro (forward and back buttons) */
#placesToolbar > #back-button > .toolbarbutton-icon,
#placesToolbar > #forward-button > .toolbarbutton-icon {
fill: var(--iconcolor) !important;
width: 17px !important;
height: 17px !important;
opacity: 100% !important;
}
/* dimensione testo barra strumenti (toolbar text) */
#placesMenu > menu > .menubar-text {
color: #000 !important;
font-size: 10pt !important; }