userChrome.css

  |   21 |   Browser |   Firefox
其实还是推荐用stylish

/*标签最小宽度*/
.tabbrowser-tab{min-width:50px !important;}

/*书签下拉菜单的最大宽度*/

menu.bookmark-item, menuitem.bookmark-item { max-width: 20em !important; }

/*书签栏下拉列表中去除"打开所有书签"以及横线,ubuntu去除书签栏文件夹图标旁的小箭头*/
.bookmark-item[container] > .toolbarbutton-menu-dropmarker,.openintabs-menuitem,.bookmarks-actions-menuseparator{display: none !important;}

/*处理小箭头*/

PersonalToolbar .toolbarbutton-1:not(#greasemonkey-tbb):not(#ipbuttons-toolbar) dropmarker{display: none !important;}

greasemonkey-tbb dropmarker{height:22px !important;width:22px !important;margin-left:-22px!important;display:inline!important;opacity:0;}

ipbuttons-toolbar dropmarker{height:22px !important;width:22px !important;margin-left:-22px!important;display:inline!important;opacity:0;}

/*右键菜单去除设置桌面背景*/

context-sendimage,#context-setDesktopBackground{display: none !important;}

/*新标签页*/
@-moz-document url("about:newtab") {

.newtab-title{text-align:center !important;}
.newtab-cell {opacity: 0.4 !important;}
.newtab-cell:hover {opacity: 1 !important;}
body{
background-size:cover !important;
background-image: url("file:///d:/XX/wall.jpg") !important;
}
#newtab-margin-bottom{opacity:0;}
#newtab-search-container,#newtab-margin-undo-container{display: none !important;}
}

请注意背景图片地址请自行设置
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