userChrome.css

@namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul");

#TabsToolbar .tab-content[pinned] {
    padding:  0 9px !important;
    height: 18px!important;
}
.tabbrowser-tab:not([pinned]) {
    max-width: 150px !important;
    min-width: 80px !important;
    height: 18px!important;
    font-size:  11px !important;
}

.tabbrowser-arrowscrollbox {
    background: #454545 !important;
}

#forward-button, #page-action-buttons, .autocomplete-history-dropmarker {
    display: none !important;
}

#TabsToolbar {
    margin: 0 44px 0 40vw !important;
    height: 30px !important;
    padding-left: 1px !important;
    background: #454545 !important;
}

#nav-bar {
    margin: -32px 60vw 0px 0px !important;
    height: 32px !important;
    padding: 0 0 0 0 !important;
}

#nav-bar-customization-target {
    background: #454545 !important;
}

#navigator-toolbox {
    background: #454545 !important;
}

#urlbar,#urlbar-container {
    background: none !important;
    border: none !important;
    margin-left: 1px !important;
    min-width: 200px !important;
    font-size: 11px !important;
    background: #454545 !important;
}

#urlbar:hover {
    background: none !important;
    border: none !important;
    box-shadow: none !important;
    background: #454545 !important;

}

#urlbar[focused="true"] {
    background: none !important;
    border: none !important;
    box-shadow: none !important;
    background: #454545 !important;

}

#TabsToolbar, #titlebar, #nav-bar {
    -moz-appearance: -moz-mac-vibrancy-light !important;
}

#navigator-toolbox::after{
    content:    none;
}

#PanelUI-button{
    position: fixed;
    top: 2px;
    right: 4px;
    border-inline-start: none;
}

.titlebar-placeholder[type="caption-buttons"] {
    -moz-box-ordinal-group: 1 !important;
}