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建议使用stylus插件加载css，虽然油猴也行。已适配手机端
/* ==UserStyle==
@name 百度网页优化去广告-Moe背景/自定义图片
@namespace ？？？
@version 1.0.9
@description 建议使用stylus插件加载css，虽然油猴也行。已适配手机端
@author yui
==/UserStyle== */
@-moz-document domain("baidu.com") {
body:before
{
content: "";
position: fixed;
top: 0;
right: 0;
bottom: 0;
left: 0;
z-index: -100;
background-image: url(https://i0.hdslb.com/bfs/album/a284e6269702e91c0e8c8302a96f961bcbaeb2b7.jpg);
background-position: center ;
background-size: cover;
background-attachment: fixed;
background-repeat: no-repeat;
opacity: .2
}
.FYB_RD, .se-ft-promlink, .c-line-clamp1{display: none}
#head{background: rgba(0,0,0,0);}
#form{background: rgba(255, 255, 255, .2);}
#rs,#page-relative{opacity: .4}
.bdsug{background: rgba(255, 255, 255, .8);}
.wrapper_new .sam_newgrid~#page {background-color: rgba(0,0,0,0);}
.wrapper_new #foot {background-color: rgba(0,0,0,0);}
.wrapper_new #foot #help {background-color: rgba(0,0,0,0);}
body .se-page-hd {background: rgba(0,0,0,0);}
#page-bd, .se-head-tablink,.c-container, .se-page-controller .new-pagenav, .se-page-copyright, .se-page-ft {background: rgba(0,0,0,0);}
.banner{opacity:0!important}
.se-form{background: rgba(0,0,0,0)}
}
@-moz-document url("https://www.baidu.com/"){
/*百度首页优化*/
#s_wrap,#bottom_layer,.s-top-nav{display: none!important}
#s_top_wrap{background: rgba(0,0,0,0);}
#form{opacity:.5}
#lg{opacity:0}}