Habe ich altes hier aus dem Forum zusammen gesucht bis es bei mir paßte, nur eben wie oben geschrieben die kleine Scrollleiste rechts und das verschieben klappt eben nicht.
ich habe jetzt mal den Teil von dir eingefügt und meins raus genommen, jetzt ist die Scrollleiste weg 
Jetzt muss ich nur noch die Tabs in der Breite einstellen denn die sind jetzt sehr breit
mein Inhalt der userChrome.css sieht so aus
CSS
#TabsToolbar
{
margin-top:-2px !important
}
.bookmark-item
{
margin-top:2px !important
}
#personal-bookmarks
{
display:block;
}
#PersonalToolbar {
display:block;
min-height: 0px!important;
max-height: 300px!important ;
}
#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"]
{
display:none;
}
#personal-bookmarks #PlacesToolbar #PlacesToolbarDropIndicator
{
display:none;
}
#personal-bookmarks #PlacesToolbar toolbarbutton.bookmark-item
{
padding-top: 2px;
padding-bottom: 2px;
padding-left: 3px;
padding-right: 3px;
}
#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;
}
/* This file can be used to customize the look of Mozilla's user interface
* You should consider using !important on rules which you want to override default settings.
*/
/* Do not remove the @namespace line -- it's required for correct functioning */
@namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"); /* set default namespace to XUL */
/* Lesezeichen Sidebar - Ordnericon stehend gelb */
@-moz-document url("chrome://browser/content/bookmarks/bookmarksPanel.xul"),
url("chrome://browser/content/history/history-panel.xul") {
treechildren::-moz-tree-image(container) {
fill:orange !important;}
}
/* Lesezeichen verwalten - Ordnericon stehend gelb */
@-moz-document url-prefix("chrome://browser/content/places/places.xul") {
treechildren::-moz-tree-image(container) {
fill:orange !important;}
}
/* Lesezeichen - Ordnericon gelb */
@-moz-document url-prefix("chrome://browser/content/browser.xul") {
.bookmark-item[container="true"] {
fill:orange !important;}
}
/*Mehrzeilige Tab-Leiste*/
/*AGENT_SHEET*/
/* tabs height for "classic tabs" */
:root {
--tab-min-height: 22px !important;
}
.tabbrowser-tab:not([pinned]) {
flex-grow: 1;
min-width: 125px !important;
max-width: 125px !important;
}
.tabbrowser-tab,.tab-background {
min-height: var(--tab-min-height);
}
.tab-stack {
width: 100%;
}
#tabbrowser-tabs .scrollbox-innerbox {
display: flex;
flex-wrap: wrap;
overflow-y: auto !important;
min-height: var(--tab-min-height);
max-height: calc(4*var(--tab-min-height)) !important; /* 3 rows */
}
#tabbrowser-tabs .arrowscrollbox-scrollbox {
overflow: visible;
display: block;
}
#tabbrowser-tabs .scrollbutton-up,
#tabbrowser-tabs .scrollbutton-down,
#alltabs-button,
.tabbrowser-tab:not([fadein]){
display: none;
}
#main-window[tabsintitlebar] #tabbrowser-tabs {
-moz-window-dragging: no-drag;
}
/* Neu */
/* tabs height for "classic tabs" */
.tabbrowser-tab{
max-height:5px!important;
}
/* runde Tabs und Trennliene */
.tab-background {
border-radius: 12px 12px 0px 0px !important;
border-image: none !important;
}
.tab-line {
display: none;
}
/* Farbe des Focus Tab */
.tab-background[selected="true"]{
background:blue!important;
}