今回はすぐに出来た(;´Д`)

javascript:with(document.body)innerHTML=innerHTML.replace(/\n.font.*\n%E3%80%80.*\n%E3%80%80.*\n
.*href.*\n.*href.*\n..font.\n.blockquote.\n<pre>[0-9]+\n+<.pre>\n\n<.blockquote>\n.hr.\n/g,'');focus()