gistfile1.txt

// ==UserScript==
// @name           Volumedown for niconico
// @namespace      http://web.zgo.jp/
// @include        http://www.nicovideo.jp/watch/*
// ==/UserScript==
var VOLUME = 80;//ボリューム
var MUTE   = 0;//ミュート時のボリューム
var w = (typeof unsafeWindow != 'undefined') ? unsafeWindow : window;
var deleted = w.so.variables.deleted;
//GM_log(deleted);
var NGtag = "\u97F3\u91CF\u6CE8\u610F", 
	tags = document.evaluate("//meta[@name='keywords']", document, null, 9, null).singleNodeValue.content,
	flvplayer = w.$("flvplayer");

(tags.split(",").some(function (tag){ return (tag == NGtag); }) && flvplayer || deleted != 0)
	? (function (){
		var Inter = setInterval(function (){
			flvplayer.ext_setVolume(MUTE);
			if(flvplayer.ext_getVolume() == MUTE)clearInterval(Inter);
		}, 100);	
	})()
	: (function (){
		var Inter = setInterval(function (){
			flvplayer.ext_setVolume(VOLUME);
			if(flvplayer.ext_getVolume() == VOLUME)clearInterval(Inter);
		}, 100);	
	})();
//.user.js