追記２

まさかここを見てということでもないでしょうが、機能しないエントリがありましたので書き足しました。

var result = document.evaluate('//div[@class="article-body-inner"]/text()[string-length(normalize-space()) > 1][last()]/following-sibling::*[not(self::br or @id="ad2")]/following-sibling::br',document, null, 7, null);
var result2 = document.evaluate('//div[@class="article-body-inner"]/text()[string-length(normalize-space()) > 1][last()]/following-sibling::br',document, null, 7, null);
var result3 = document.evaluate('//div[@class="article-body-inner"]/div[./span[not(./text())]][last()]/following-sibling::div',document, null, 7, null);
var result4 = document.evaluate('//div[@class="article-body-inner"]/div[./a][last()]/following-sibling::div[./span or ./br]',document, null, 7, null);

	for(var i=0;i<result.snapshotLength;i++) 
	{ 
  		result.snapshotItem(i).style.display="none";
	}

  for(i=0;i<result2.snapshotLength;i++) 
	{ 
  		result2.snapshotItem(i).style.display="none";
	}

  for(i=0;i<result3.snapshotLength;i++) 
	{ 
  		result3.snapshotItem(i).style.display="none";
	}
  for(i=0;i<result4.snapshotLength;i++) 
	{ 
  		result4.snapshotItem(i).style.display="none";
	}

@-moz-document url-prefix("http://lineblog.me/nishino/") {
  .article{padding:0;}
  .article-footer {margin:0;}
  .article-share-buttons {padding:0;}
  .article-body-inner table{display:none;}
}