自定义css

stylish扩展不装也可以的
#urlbar, #TabsToolbar, #browser-bottombox, #nav-bar  {
   background: transparent !important;
   border: none !important;
}/* 地址栏透明 */
/* 隐藏书签工具栏书签图标 */
.bookmark-item > .menu-iconic-left > .menu-iconic-icon {display: none;}
/* 隐藏地址栏图标 */
#identity-box {display: none !important;}
/* 隐藏最大化图标 */
#titlebar-max{display: none !important}
/* 隐藏最小化图标 */
#titlebar-min{display: none !important}
/* 隐藏关闭图标 */
#titlebar-close{display: none !important}
/* 最小化最大化关闭图标透明 */
#titlebar-max{opacity: 0.1 !important; }
#titlebar-max:hover{opacity:1 !important;}
#titlebar-min{opacity: 0.1 !important; }
#titlebar-min:hover{opacity:1 !important;}
#titlebar-restore{display: none !important;}
#titlebar-close{opacity: 0.1 !important; }
#titlebar-close:hover{opacity:1 !important;}
.tabbrowser-tab { height: 20px !important}/* 标签栏高度 */
#appmenu-button {display: none !important}/* 火狐橙色按钮 */
#star-button {display: none !important}/* 地址栏星型按钮 */
#addonbar-closebutton {display:none !important}/* 状态栏关闭按钮 */
.autocomplete-history-dropmarker {display: none !important}/* 地址栏下拉按钮 */
.statusbar-resizerpanel {display:none !important}
/*地址栏字体定义，定义了字体系列，字体加粗，字体尺寸。*/
#urlbar {
  font-size: 10pt !important;
  font-family: "Ubuntu" "Microsoft YaHei";
  font-weight: 500;
}

/*文字输入框字体定义，定义了字体系列，字体加粗，字体尺寸，下边距。*/
.textbox-input-box {
font-family: "Ubuntu" "Microsoft YaHei";
font-weight: normal !important;
font-size: 10pt !important;
margin-bottom: 1px !important;
}
textbox:focus, textarea:focus, input:focus
/* 地址栏蓝色边框 */{
/*  -moz-box-shadow: orange 1px 1px 1px;*/
  -moz-box-shadow: #33CCFF 1px 1px 1px, #33CCFF 1px 1px 1px, #33CCFF 1px 1px 11px, #33CCFF 1px 1px 11px;  
}

select:focus, input:not([type="checkbox"]):not([type="radio"]):focus
{
  -moz-appearance: none !important;
}
/* 透明右键菜单 */
/* by makondo, 07/09, thanks to Barbiegirl - i'm sure there bits of her code somewhere here! */
@namespace url(http://www.w3.org/1999/xhtml);
@namespace url(http://www.mozilla.org/keymaster/gateke ... s.only.xul);

/* shortcut keys > */ menuitem hbox[anonid="accel"],
#contentAreaContextMenu menuitem[disabled="true"],
#contentAreaContextMenu menuitem[disabled="true"] menuseparator,
.autorepeatbutton-up, .autorepeatbutton-down
{ display: none !important; }

menu>.menu-right, #mmsearch-context > .menu-right
{ -moz-appearance: none !important;
list-style-image: url("data:image/gif;base64,R0lGODlhCQAJAIAAAAAAAP///yH5BAkAAAEALAAAAAAJAAkAAAIPBIIZdorsnolrKnhtwpkWADs=") !important; }

/* menu separators */
menuseparator
{ -moz-appearance: none !important;
margin: 1px 6px !important;  
border: 1px solid transparent !important;
background: url("data:image/gif;base64,R0lGODlh9wAFALMPAAAAABAQECAgIDAwMEBAQFBQUGBgYHBwcICAgJCQkKCgoLCwsMDAwNDQ0ODg4PDw8CwAAAAA9wAFAEAEWhDJSau9OOvNu/9gKI5kCQJoqq5s675wLM90bd94ru+24//AoHBILBqPyKRyyWw6n9Aok0GtWq/YrHbL7Xq/4LB4TC6bz+KDes1uu9/wuHxOr9vv+Lx+z+/jIwA7") repeat-x !important; }

popup:not(#autoscroller), menupopup, context-menu
{ -moz-appearance: -moz-win-glass !important;
background: rgba(183,191,189,0.5) !important;
color: #2C4346 !important;
text-shadow: white 1px 1px 1px !important;
font-size: 13px !important;
font-weight: bold !important;  
-moz-border-radius: 8px !important;
padding: 0 6px 0 0 !important; }

menupopup, popup, context-menu
{ border-left: 2px solid white !important;
border-right: 2px solid #7A9C9F !important;
-moz-border-top-colors: white #ccc #D1DFE1 !important;
-moz-border-bottom-colors: #435657 #83BBBF #ccc !important;
-moz-border-left-colors: white #ccc #ccc !important;
-moz-border-right-colors:  #666 #4CB5B8 #274D54 !important;
-moz-box-shadow: inset -10px 20px 25px rgba(170,190,186,0.5) !important; }

menubar > menu:hover, menupopup > menu:hover, popup > menu:hover, menuitem:hover, menubar > menu:focus, menupopup > menu:focus, popup > menu:focus, menuitem:focus
{ -moz-appearance: none !important;
background: transparent !important;
-moz-box-shadow: inset rgba(98,128,136, 0.5) 1px 6px 8px 2px  !important;
-moz-border-radius: 8px !important;
border-top: 2px solid #E4F4F6 !important;
border-bottom: 2px solid #75B7BD !important;
border-left: 2px solid #F1F7E9 !important;
border-right: 2px solid #7A9C9F !important;
-moz-border-top-colors: #C5D3D4 #9EA9AA#8E9899 !important;
-moz-border-bottom-colors: #435657 #69D2E0 #ccc !important;
-moz-border-left-colors: #F1F7E9 #ccc #ccc !important;
-moz-border-right-colors:  #666 #4CB5B8 #274D54 !important; }

*:not(menulist) > menupopup, popup:not([type="autocomplete"])
{ padding: 2px !important; }

#contentAreaContextMenu
{ margin-left: 20px !important;
margin-top: 20px !important; }

/* Menubar */
#main-window #navigator-toolbox #toolbar-menubar
{ -moz-appearance: none !important;
background: transparent !important; }

/* menuitems */
menubar > menu, menupopup > menu, popup > menu, menuitem
{ -moz-appearance:  -moz-win-glass !important;
color: black !important;
font-size: 13px !important;
font-weight: bold !important;
border: 2px solid transparent !important; }
/* 浮动侧边栏 */
#sidebar-box{
-moz-appearance: none !important;
-moz-border-image: url("data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAEgAAAAvCAYAAABAHIylAAAACXBIWXMAAAsTAAALEwEAmpwYAAAAIGNIUk0AAHolAACAgwAA+f8AAIDpAAB1MAAA6mAAADqYAAAXb5JfxUYAAAUlSURBVHja7JtPaBRXHMc/781OdnXNqinVlphK4iJoQWiLGIjgLV6UEBFLEcFzLr0JihdB8OjNkwdBWCkKIejFXIKYQkR6CS2Gsv5rjE0sSN11kzWz814P+ya+vMxGL4Xdzfzgx7x9O4edD9/fmzfz+67QWrNeCCGEO9Vg3MyhG4zRnwAg4r53oAgniRm3AhwdM7bnYmGtAWTBiSBI6yiduWaH5AJR1lE5czoO0ipAFhwbhGeltI4upGZWkA0ltI6h9Tk6ZxWkFUAOnChTVmaAHcBWIAukY8qtWeEAfAAqwDvgDVAFalYqK1cgCa11HBzPQPGBDuBrz/P6BgcH1aFDh6pHjx4t9/f3V2mhmJqayty/f7/z0aNHmfHxcRmG4TPgb2AZCAyk0IVkAxKOajqMSvbm8/kdV65c+efkyZNl2iDu3LnTef78+S+LxeIb4E+jrmVHTdoFFCknUk0G6NmzZ09vsVgsAoyMjBwYHx8fLpVKfUEQdLUSFN/33+ZyuWeDg4Oj165dmwbI5/P5p0+fPgdmTclFagoBpbXW9u3bs5STAbZ6nvdDoVCYP3XqVOnw4cM/Pnny5KdUKrUspQyFELqVAGmthVLKq9VqHfv27bs1OTn5S6FQyJ0+ffor4DezNlUtJYWA9pxbuG/KKgPsPnHiRPrSpUsLIyMjByYmJn5Op9NLUkq1du/Y/CGEQEqpPM+rzc/Pf//69evfz507Nzs9Pb1lZmYmBZSchVoDWlp3IumoqGtgYKAMcO/evTO+739oNdU0AKV93/8wNjZ2BmBgYKACbDfXnLK2MQJnL+MC6jx+/HgJoFKp9EgpQ9okpJRhuVzeDTA0NPQOyK0HCKfMIkjpfD4fACilsu2gHltFSqmsWaiDGDgrwpHOM5cNyGPjRCpOPa6ChLOL3kiAPOfahbsGxUESGwiQaPB8KaTzNB73amOjAIp7pYNc50XYRgS0hoUkifW3BAmCBFACKAGUAEoAJYASQAmgJBJACaD/F5DrgNAbiIOmgQNEOhO24yGcmZnpAJBSVkyLqG2e3oUQSwAvXrzwWW1gsFkgiXdAKKA6Nja2DSCbzc4qpdrmDWMYhl4ul3sOUCgUvgAWcdo9ERPZAI4C3k9OTnYBHDt27GYQBOl2UJHWWgRBkB4aGroJ8PDhw+3UTQ0qDpLdOIwsLpFpQRSLxXxvb++7CxcuvLx7965eWFj4TgihTbYcGKVUKgiCzP79+2/dvn174vr1611Xr17tA54B71nbWVVuTz4DbAY6qdtcdu/atWvn7Ozsr7CqN58PgmBbKwHyff/fXC5XtHvzPT09A69evVoAXlJvPZdNuVUxjg+3L58GNlH3/+RM7u3u7s5evnz5j7Nnz75thzXoxo0bXRcvXvx2bm6uQt3dUTJZAZaouz1qQOh2VSPjwiZgi1FSJ9Atpfymv79/4eDBg2+Hh4ffHDlyZLGVoDx48GDz6OjojsePH3dNTU3tVEr9BcwZ1ZRNiS1ZZbZSYo3cHZsNpKzJLdQdZjnzXQfN7VN0787LpnxK1B1m741iKma8GLMG6ZTWOlpwI99ezZwkrW2AMvNVPrZpU6ztqzUroOj3R9dWNWpZdFRju8z05zrMMlZ2NADU7B5FF1AEKcrPcphBY49ilL5J2/XaKgqKHK2ByWUr1/coRntvB5LrcvX52OC3e9nQ/D5p5UCqWVA+7XI1+wRqtVrik6aBT9r3fQAbUuK0jwPkQLJBbez/atiA7HBguUDa/t8+/w0Aop+YsD/C4DEAAAAASUVORK5CYII=")
13 13 15 / 14px 13px 15px repeat stretch !important;
-moz-window-shadow: none !important;
background: none !important;
color: #ffffff !important;
opacity: 0.95 !important;
}

#sidebar-splitter{display:none}

#sidebar-box{position:fixed!important;top:60px;bottom:0px}
#sidebar-header{width:100%;background-color:transparent!important;-moz-appearance:none!important}

#sidebar{height:95%;background-color:transparent!important;width:100%!important}
#bookmarksPanel *,#history-panel *{background-color:transparent!important}
#bookmarksPanel ,#history-panel{background-color:transparent!important}
#bookmarksPanel ,#history-panel{color:grey!important}
#bookmarksPanel *,#history-panel *{color:grey!important}
/* 浮动书签工具栏 */
@namespace url(http://www.mozilla.org/keymaster/gateke ... s.only.xul);
@-moz-document url(chrome://browser/content/browser.xul) {

#main-window:not([inFullscreen="true"]) #navigator-toolbox:not([customizing="true"]) ~ #browser {
margin-top: -25px !important;/* 适当调整 */
}

#main-window:not([inFullscreen="true"]) #navigator-toolbox:not([customizing="true"]) > #PersonalToolbar {
-moz-transition: max-height 0s ease-in-out .1s !important;
-moz-box-ordinal-group: 1000 !important;
padding: 0 3px !important;
position: relative !important;
z-index: 100 !important;
overflow-y: hidden !important;
max-height: 1px !important;
min-height: 1px !important;
}

/*
#main-window[stylish-url="about:blank"] #navigator-toolbox:not([customizing="true"]) > #PersonalToolbar,*/
#main-window:not([inFullscreen="true"]) #navigator-toolbox:not([customizing="true"]):hover > #PersonalToolbar {
-moz-transition: max-height 0s ease-in-out !important;
max-height: 30px !important;
}

}