userChrome.css

/* Firefox CSS stylesheet */

#appcontent,
#appcontent > #content,
#appcontent > #content > tabbox > tabpanels {
	background: #fbfbfb !important;
}
     
.tabbrowser-arrowscrollbox > .scrollbutton-up,
.tabbrowser-arrowscrollbox > .scrollbutton-down,
toolbarbutton#appmenu-toolbar-button,
toolbarbutton#alltabs-button,
.tab-icon-image,
.tabs-closebutton-box,
.tab-close-button,
#urlbar dropmarker,
#identity-box,
#star-button,
#go-button,
.tab-throbber,
.tab-throbber[progress] {
	display: none !important;
}
     
#main-window:not([disablechrome]) #navigator-toolbox[tabsontop=true] {
	border-bottom: 0px !important;
}

tab {
	border-bottom: 2px solid !important;
	border-bottom-color: #30303a !important;
}
    
tabs#tabbrowser-tabs, tabs#tabbrowser-tabs * {
	-moz-appearance: none !important;
	border-radius: 0px !important;
	background-image: none !important;
	margin-top: 0px !important;
	height:18px !important;
}
     
tabs#tabbrowser-tabs {
	background: #121212 !important;
	text-align: center !important;
}
     
.tabbrowser-tab {
	max-height: 12px !important;
	margin-left: 0px !important;
	margin-right: 0px !important;
	padding-top: 3px !important;
	padding-bottom: 8px !important;
	border: none !important;
	color: #888 !important;
	background: #121212 !important;
}
    
.tabbrowser-tab:hover, .tabbrowser-tab:active {
	background: #383838 !important;
	color: #eee !important;
}
     
.tabbrowser-tab[selected=true], .tabbrowser-tab[selected=true]:hover {
	color: #121212 !important;
	background: #888 !important;
	box-shadow: inset 0px 0px 2px rgba(0,0,0,0.12) !important;
}
     
.tabbrowser-tab .tab-text {
	margin-left: 3px !important;
	margin-right: 3px !important;
	margin-top: -2px !important;
	font-size: 8pt !important;
	font-family: Terminus !important;
}

.tabs-newtab-button {
    display: none !important;
}

.titlebar-placeholder[type="caption-buttons"] {
	margin-left: 10px !important;
}
     
.tabbrowser-tabs:not([drag=detach]) > .tabbrowser-tab:not([pinned])[fadein] {
	min-width: 30px !important;
	max-width: 330px !important;
}
     
notificationbox {
	overflow-x: hidden;
}
     
browser[type="content-primary"], browser[type="content-targetable"] {
	overflow-y: scroll;
	margin-right: -8px;
}