追記３

また気になって書き換えたので置いておきます

var result = document.evaluate('//div[@class="article-body-inner"]/descendant::text()[string-length(.)>5][not(./ancestor::a)][last()]/ancestor::div[not(@class or @style)][1]/following-sibling::div[not(./a or ./iframe)]',document, null, 7, null);
for(var i=0;i<result.snapshotLength;i++) 
	{ 
  		result.snapshotItem(i).style.display="none";
	}

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