Geschlossene Tabs werden nach Neustart wieder hergestellt, Tab-Lücke nicht geschlossen

/* ### Tabs-Toolbar ###################################### */
#TabsToolbar:not(:-moz-lwtheme)
{ 
 color:pink !important;
 margin-top:-11px !important;
}

#TabsToolbar:-moz-lwtheme 
{ 
 margin-top:-10px !important;
}

#TabsToolbar
{ 
 margin-bottom:0px !important;
 padding-top:4px !important;
} 
 
#menubar-items :not([fokus]), #tabbrowser-tabs :not([fokus])
{
 opacity:1 !important;
}

/* ### Mehrzeilige Tabreihen ############################# */
[tabsintitlebar="true"][sizemode="maximized"] #navigator-toolbox {
padding-top: 10px !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;
}

#tabbrowser-arrowscrollbox {
  margin-top: -3px !important;
  margin-bottom: -20px !important;
}

:root {
    --tab-min-height: 30px !important; 
}

:root #tabbrowser-tabs {
    --tab-min-height: 30px !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 */
}

/* Tab schließen Icon nur im aktiven Tab */

.tab-close-button {
display:none!important;
}

.tabbrowser-tab[selected="true"] .tab-close-button {
display: block !important; 
}

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

/* 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;
}    
 
/* Button for scrolling tabs to the left */
.scrollbutton-up
{
 display:none;
}

/* Button for scrolling tabs to the right */
.scrollbutton-down
{
 display:none;
}

/* Höhe für '+'-Button (newtab) */
.tabs-newtab-button 
{
 vertical-align:bottom !important;
 /*vertical-align:top !important;*/
 height:var(--tab-min-height:) !important;
}

/*Drop-down menu for all tabs */
#alltabs-button
{
 display:none;
}

/* Darstellung Tabs aus alter UserChrome   ####################################################### */
#toolbar-menubar:not([autohide=true]) ~ #TabsToolbar > #tabbrowser-tabs > .tabbrowser-tab > .tab-stack > .tab-background
{
 border:none!important;
}
 
#TabsToolbar .tabbrowser-tab
{
 max-width:140px !important;
 height:22px !important;
 border:1px solid #0081FD !important;
 /*border-bottom:0 !important; */
 border-top-left-radius:8px !important;
 border-top-right-radius:8px !important;
 /* alt: margin:1px 1px auto 0 !important;*/
 margin:1px 1px 0 0 !important;
 padding:0 !important; 
 font:11px 500 Arial, sans-serif !important;
 color:#FFD700 !important;
 -moz-box-flex:0 !important;
}

/* TAB bei Mauskontakt: * Hintergrundfarbe, Rahmen */
#TabsToolbar .tabbrowser-tab:HOVER
{
 border:1px solid #FFF !important;
    background:#2896FF !important;
    color:#00478A !important;
}

/* TAB aktiv */
#TabsToolbar .tabbrowser-tab[selected="true"]
{
 background:#0081FD !important;
 font-weight:bold !important;
 color:#FFFFB5 !important;
 border-color:#FF0 !important;
}

/* Tab-Icons */
#TabsToolbar .tab-icon-image
{
 height:16px !important;
 width:16px !important;
 margin-left:-8px !important;
 margin-bottom:1px !important;
}
  
/* Tab-Close X */
#TabsToolbar .tab-close-button
{
 margin-right:-12px !important;
 /*margin-left:auto !important;*/
 /*padding:0 !important;*/
 font-size:16px;
 font-weight:bold;
 color:#FFD700 !important;
}

#TabsToolbar .tab-close-button .toolbarbutton-icon
{
 height:16px !important;
 width:16px !important;
 /*background-color:#BDFEFF !important;*/
 /*border-radius:5px !important;*/
}

/* Close-Button inaktiver Tab */
tab:not([selected]) .tab-close-button
{
 display:block !important;
 color:#72B7F9 !important;
 /*margin-right:-5px !important;*/
}

/* Alle anderen Elemente in TABs */
#TabsToolbar .tabbrowser-tab *
{
 background:none !important;
}

/* Tab-Rahmenelemente entfernen (obere Linie aktiver Tab, Seitentrennlinien) */
#toolbar-menubar:not([autohide="true"]) + #TabsToolbar .tabbrowser-tab > .tab-stack > .tab-background,
:root:not([tabsintitlebar]) .tab-background,
:root[extradragspace] .tab-background
{
 border-top-style:none !important;
}

.tabbrowser-tab::AFTER,
.tabbrowser-tab::BEFORE
{
 border-left:none !important;
}

.searchbar-textbox, #urlbar
{
 border-radius:10px !important;
 min-height:30px !important;
 padding:0 !important;
 margin:0 !important;
 background:#002344;
}

/* Schrift Tabs nachträglich */
.tab-text
{
 font-size:11px !important;
 font-weight:500;
 color:#FFF !important;
}

/* @-moz-document url-prefix("chrome://browser/content/browser.xhtml") */ 
.tab-label-container[textoverflow][labeldirection=ltr]:not([pinned]),
.tab-label-container[textoverflow]:not([labeldirection]):not([pinned]):-moz-locale-dir(ltr)
{
 direction:ltr;
 mask-image:linear-gradient(to left, transparent, black 0em) !important;
}