Multirow-Tableiste mit userChrome.css anpassen für FF 89.0

/* Tableiste mehrreihig */
@-moz-document url(chrome://browser/content/browser.xhtml) {

[tabsintitlebar="true"][sizemode="maximized"] #navigator-toolbox {
padding-top: 8px !important;
}

#titlebar,#tabbrowser-tabs {
appearance: none !important;
}

[tabsintitlebar="true"] #TabsToolbar > .titlebar-buttonbox-container,
#main-window[inFullscreen="true"] #window-controls {
display: block;
}

/* Mehrreihige Tableiste, Anzahl der angezeigten Tabreihen = 3 Zeilen, weitere per Scrollbar */
box[class="scrollbox-clip"][orient="horizontal"],
tabs > arrowscrollbox { display: block; }
scrollbox[part][orient="horizontal"] {
display: flex;
flex-wrap: wrap;
max-height: calc(var(--tab-min-height) * 3); /* Anzahl der angezeigten Tabreihen = 3 Zeilen */
overflow-x: hidden;
overflow-y: auto;
}

tabs tab[fadein]:not([pinned]) {
flex-grow: 1;
}

tabs tab,.tab-background {
height: var(--tab-min-height);
overflow: hidden;
}

tab > .tab-stack {
width: 100%;
}

box[class="scrollbox-clip"][orient="horizontal"] {
-moz-window-dragging: no-drag;
}

hbox.titlebar-spacer,
#alltabs-button,tabs tab:not([fadein]) {
display: none;
}

#tabbrowser-arrowscrollbox {
  margin-top: -26px !important;
  margin-bottom: -32px !important;
}


/* Feste Breite der einzelnen Tabs wenn gewünscht, sonst entfernen bzw. verbreitern */
tabs tab[fadein]:not([pinned]) {
min-width: 150px !important;/* Minimale Tabbreite 76px */
max-width: 150px !important;/* Maximale Tabbreite 225px */
}
}

/* Buttons/Zwischenräume Ausblenden */
hbox.titlebar-spacer,
#alltabs-button,tabs tab:not([fadein]), 
[class="scrollbutton-up"],
[class="scrollbutton-up"] + spacer,
scrollbox[part][orient="horizontal"] + spacer,
[class="scrollbutton-down"] { 
    display: none; 
}
tabs tab {
    border-left: solid 1px hsla(0,0%,50%,.5);
    border-right: solid 1px hsla(0,0%,50%,.5);
}
tabs tab:after,tabs tab:before { display: none;}

/* #TabsToolbar:not(:-moz-lwtheme){ 
    color: black !important;
} */
#TabsToolbar > .titlebar-buttonbox-container {
    display: none !important;
}    

/* -----------------------------*/
/* Tab: Optische Anpassungen    */
/* -----------------------------*/

#tabbrowser-tabs :not([fokus]){
    opacity: 1!important;
}

/* Schriftart/Schriftgröße ändern */
.tabbrowser-tab .tab-label {
    text-shadow: 1px 1px 0px #000000 !important;    
    font-weight: 500 !important;
    font-size:   12px !important;
    font-family: "Arial" !important;
}

.tabbrowser-tab .tab-label:not(:-moz-lwtheme) {
    text-shadow: none !important; 
}
   
.tabbrowser-tab .tab-label[selected="true"] {
    text-shadow: 1px 1px 0px #000000 !important;
    font-weight: 500 !important;
    font-size:   12px !important; 
    font-family: "Arial" !important; 
}

/* Inaktive Tabs Schrift kursiv */
.tabbrowser-tab:not([selected]) {
    font-style: italic !important;
}
    
/* Aktiver Tab */
.tabbrowser-tab[selected] .tab-content {
    background: rgba(255,46,250,1) !important;
    color: white !important;
}
.tabbrowser-tab[selected] .tab-content:hover{
    background: yellow !important;
    color: blue !important; 
}

/* Tab ungelesen */
.tabbrowser-tab[pending] .tab-content{    
    background:  rgba(0,37,255,0.39) !important;
    color: yellow !important;
}
.tabbrowser-tab[pending] .tab-content:hover{
    background: orange !important;
}

/* Tab gelesen */
.tabbrowser-tab .tab-content {
    background: rgba(0,234,255,0.38) !important;
    color: white !important; 
    padding-bottom: 9px !important;
}
.tabbrowser-tab .tab-content:hover {
    background: orange !important;
    color: white !important; 
}




/* Tab-Line entfernen */
#TabsToolbar .tabbrowser-tab .tab-line {
    display: none !important; 
}

/* Tab-Höhe  */
.tabbrowser-tab {
    min-height: 28px !important;
    max-height: 28px !important;
    vertical-align: bottom !important;
    margin-top: 1px !important;
    margin-bottom: 1px !important;
}

/* Tab-Rahmen entfernen */
#TabsToolbar .tabbrowser-tab[visuallyselected="true"],
#TabsToolbar .tabbrowser-tab,
#TabsToolbar .tabbrowser-tab .tab-background {
    background: unset !important;
    border-top: unset !important;
    outline: none !important;
}

/* Tab-Schließen-Button entfernen *//*
.tabbrowser-tab .tab-close-button {
  visibility: collapse !important;
}
*/

/************* Tabschliessen-Button ****************/
.tab-close-button.close-icon{
    display: -moz-box !important;
    width: 20px; height: 20px !important;
    border: none !important;
    background-color: none !important;
}

.tab-close-button {
    color: white !important; /* Farbe des Kreuzes */
}