(btn => {
	var tab = arg => gBrowser.loadOneTab(
		arg ? gClipboard.read() : "about:newtab", null, null, null, false, false, false
	);
	var mod = e => e.ctrlKey || e.shiftKey;
	addEventListener("contextmenu", e => mod(e) || e.preventDefault(), false, btn);
	btn.checkForMiddleClick = (b, e) => {
		if (e.button) e.button == 1 ? tab() : mod(e) || requestAnimationFrame(tab);
	}
	addDestructor(() => delete btn.checkForMiddleClick);

})(document.getAnonymousElementByAttribute(gBrowser.mTabContainer, "class", "tabs-newtab-button"));

this.onmousedown =e=> {

this.__defineGetter__("scroller", function() {
    var doc = content.document;
    var root = doc.documentElement;
    var body = doc.body || root;
    return body.scrollHeight > root.scrollHeight ? body : root;
});


this.onmouseup =e=>{                    // левый клик
  if ( e.button && !e.ctrlKey && !e.shiftKey && !e.altKey && !e.metaKey ) return;
    clearTimeout(self.timer);
    var scroller = this.scroller;
    if(scroller.scrollTop !=0 )
        content.scrollTo(scroller.scrollHeight, 0);
    else
        content.scrollTo(0, scroller.scrollHeight);
}


if ( e.button == 0 && !e.ctrlKey && !e.shiftKey && !e.altKey && !e.metaKey )  // длинный левый клик
  self.timer = setTimeout(()=>{
  self.onmouseup = '';
    var scroller = this.scroller;
    content.scrollTo(0, (scroller.scrollHeight - scroller.clientHeight)/2);
}, 500);


this.onclick =e=> {                    // правый клик
  if ( e.button == 2 ) gShowPopup(this);
}

};
self.onclick =e=> e.preventDefault();


// Подсказка для кнопки ..........
this.onmouseover =()=> {
  this.tooltipText = "ЛКМ:    Вверх/Вниз по странице \nдЛКМ:  Центрирование страницы"
}

// Сохранять изображение без запроса в указанную папку, из контекстного меню ..........
((contextMenu, viewimage) => {
   var path = 'E:\\Download';

   var menuItem = contextMenu.insertBefore(document.createElement("menuitem"), viewimage);
   menuItem.setAttribute("label", "Сохранить изображение в папку: " + path);
   menuItem.setAttribute("class", "menuitem-iconic");
   menuItem.setAttribute("image", "data:image/x-icon;base64,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");
   addDestructor(()=> menuItem.remove());
   addEventListener("popupshowing", e=> menuItem.hidden = viewimage.hidden, false, contextMenu);

   menuItem.onclick =()=> {
      var run = cbu.getPrefs("browser.download.folderList");
      var use = cbu.getPrefs("browser.download.useDownloadDir");
      try { var dir = Services.prefs.getComplexValue("browser.download.dir", Ci.nsISupportsString).data }
      catch(e) { var dir = Services.downloads.defaultDownloadsDirectory.path };

      cbu.setPrefs("browser.download.folderList", 2);
      cbu.setPrefs("browser.download.useDownloadDir", true);
      cbu.setPrefs("browser.download.dir", convertFromUnicode("UTF-8", path));

      save();

      cbu.setPrefs("browser.download.folderList", run);
      cbu.setPrefs("browser.download.useDownloadDir", use);
      cbu.setPrefs("browser.download.dir", convertFromUnicode("UTF-8", dir));
   };

   function save() {
      var func = eval(
         gContextMenu.saveMedia.toSource()
            .replace(/(false,\s+)false,/, "$1true,")
            .replace(/^s/, "0,function s")
         );
      (save = () => func.call(gContextMenu))();
   };

   function convertFromUnicode(charset, str) {
      var converter = Cc["@mozilla.org/intl/scriptableunicodeconverter"].createInstance(Ci.nsIScriptableUnicodeConverter);
      converter.charset = charset;
      str = converter.ConvertFromUnicode(str);
      return str + converter.Finish();
   };
})(document.getElementById("contentAreaContextMenu"), document.getElementById("context-viewimageinfo"));

(u => {
	var id, lfs = url => gBrowser.selectedBrowser.messageManager.loadFrameScript(url, false);
	var max = () => {
		var url = u([
			"var args = [scroller.scrollHeight, 0];",
			"scroller.scrollTop != 0 || args.reverse();",
			"content.scrollTo(...args);"
		].join("\n\t"));
		(max = () => lfs(url))();
	}
	var mid = () => {
		var url = u("content.scrollTo(0, (scroller.scrollHeight - scroller.clientHeight) / 2);");
		(mid = () => id = lfs(url))();
	}
	var obj = {
		mousedown: () => id = setTimeout(mid, 500),
		mouseup: () => id && max(id = clearTimeout(id))
	};
	this.onmousedown = this.onmouseup = e => e.button || obj[e.type]();
	this.tooltipText = "ЛКМ:    Вверх/Вниз по странице \nдЛКМ:  Центрирование страницы";

})(code => "data:," + encodeURIComponent(`(doc => {
	var root = doc.documentElement;
	var body = doc.body || root;
	var scroller = body.scrollHeight > root.scrollHeight ? body : root;
	${code}
})(content.document)`));

(viewimage => addEventListener("popupshowing", {
	path: "E:\\Download",
	handleEvent(e) {
		if (viewimage.hidden) return;
		var menuitem = document.createXULElement("menuitem");
		menuitem.className = "menuitem-iconic";
		menuitem.setAttribute("oncommand", "saveImg()");
		menuitem.setAttribute("label", "Сохранить изображение в папку: " + this.path);
		menuitem.setAttribute("image", "data:image/x-icon;base64,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");
		viewimage.before(menuitem);
		addDestructor(() => menuitem.remove());
		this.handleEvent = () => menuitem.hidden = viewimage.hidden;
		menuitem.saveImg = () => {
			var p = Services.prefs;
			var data = Object.assign(Object.create(null), {
				"browser.download.folderList": {type: "Int", set: 2},
				"browser.download.useDownloadDir": {type: "Bool", set: true},
				"browser.download.dir": {type: "String", set: this.path}
			});
			var save = eval(`(function ${gContextMenu.saveMedia})`.replace(
				"\n        false, // don't", "\n        true, //"
			));
			(menuitem.saveImg = () => {
				for(var pref in data) {
					var obj = data[pref], meth = `et${obj.type}Pref`;
					obj.val = p.prefHasUserValue(pref) ? p["g" + meth](pref) : null;
					p["s" + meth](pref, obj.set);
				}
				try {save.call(gContextMenu);} finally {
					for(var pref in data) data[pref].val === null
						? p.clearUserPref(pref)
						: p[`set${data[pref].type}Pref`](pref, data[pref].val);
				}
			})();
		}
	}
}, false, viewimage.parentNode || 1))(document.getElementById("context-viewimageinfo"));

(func => this._handleClick = () => {
	var saveToFile = (fileContent, fileName) => {
		var uc = Cc["@mozilla.org/intl/scriptableunicodeconverter"].createInstance(Ci.nsIScriptableUnicodeConverter);
		uc.charset = "utf-8";
		fileContent = uc.ConvertFromUnicode(fileContent);

		var fp = Cc["@mozilla.org/filepicker;1"].createInstance(Ci.nsIFilePicker);
		fp.init(window, "", fp.modeSave);
		fp.defaultString = fileName;
		fp.appendFilters(fp.filterHTML);
		fp.appendFilters(fp.filterAll);
		fp.open(rv => {
			if (rv != fp.returnOK && rv != fp.returnReplace) return;

			var stream = Cc["@mozilla.org/network/file-output-stream;1"].createInstance(Ci.nsIFileOutputStream);
			stream.init(fp.file, 0x02|0x20|0x08, 0o666, 0);
			stream.write(fileContent, fileContent.length);
			stream.close();
		});
	}
	var msgName = _id + ":SaveSnapshotToHTML";
	var msgListener = msg => saveToFile(...msg.data);
	messageManager.addMessageListener(msgName, msgListener);
	addDestructor(() => messageManager.removeMessageListener(msgName, msgListener));

	var url = "data:," + encodeURIComponent(
		`(${func})(ChromeUtils.import("resource://gre/modules/Services.jsm").Services);`.replace("%MSG_NAME%", msgName)
	);
	(this._handleClick = () => gBrowser.selectedBrowser.messageManager.loadFrameScript(url, false))();

})(({io, focus}) => {
	var resolveURL = function (url, base) {
		try {
			return io.newURI(url, null, io.newURI(base)).spec;
		} catch {}
	};

	var getSelWin = function (w) {
		if (w.getSelection().toString()) return w;
		for (var i = 0, f, r; f = w.frames[i]; i++) {
			try {
				if (r = getSelWin(f)) return r;
			} catch(e) {}
		}
	};

	var encodeImg = function (src, obj) {
		var canvas, img, ret = src;
		if (/^https?:\/\//.test(src)) {
			canvas = doc.createElement('canvas');
			if (!obj || obj.nodeName.toLowerCase() != 'img') {
				img = doc.createElement('img');
				img.src = src;
			} else {
				img = obj;
			};
			if (img.complete) try{
				canvas.width = img.width;
				canvas.height = img.height;
				canvas.getContext('2d').drawImage(img, 0, 0);
				ret = canvas.toDataURL((/\.jpe?g/i.test(src) ? 'image/jpeg' : 'image/png'));
			} catch (e) {};
			if (img != obj) img.src = 'about:blank';
		};
		return ret;
	};

	var toSrc = function (obj) {
		var strToSrc = function (str) {
			var chr, ret = '', i = 0, meta = {'\b': '\\b', '\t': '\\t', '\n': '\\n', '\f': '\\f', '\r': '\\r', '\x22' : '\\\x22', '\\': '\\\\'};
			while (chr = str.charAt(i++)) {
				ret += meta[chr] || chr;
			};
			return '\x22' + ret + '\x22';
		},
		arrToSrc = function (arr) {
			var ret = [];
			for (var i = 0; i < arr.length; i++) {
				ret[i] = toSrc(arr[i]) || 'null';
			};
			return '[' + ret.join(',') + ']';
		},
		objToSrc = function (obj) {
			var val, ret = [];
			for (var prop in obj) {
				if (obj.hasOwnProperty(prop) && (val = toSrc(obj[prop]))) ret.push(strToSrc(prop) + ': ' + val);
			};
			return '{' + ret.join(',') + '}';
		};

		switch (Object.prototype.toString.call(obj).slice(8, -1)) {
			case 'Array': return arrToSrc(obj);
			case 'Boolean':
			case 'Function':
			case 'RegExp': return obj.toString();
			case 'Date': return 'new Date(' + obj.getTime() + ')';
			case 'Math': return 'Math';
			case 'Number': return isFinite(obj) ? String(obj) : 'null';
			case 'Object': return objToSrc(obj);
			case 'String': return strToSrc(obj);
			default: return obj ? (obj.nodeType == 1 && obj.id ? 'document.getElementById(' + strToSrc(obj.id) + ')' : '{}') : 'null';
		}
	};

	var mainWin = {};
	focus.getFocusedElementForWindow(content, true, mainWin);
	mainWin = mainWin.value;

	var selWin = getSelWin(mainWin), win = selWin || mainWin, doc = win.document, loc = win.location;
	var ele, pEle, clone, reUrl = /(url\(\x22)(.+?)(\x22\))/g;

	if (selWin) {
		var rng = win.getSelection().getRangeAt(0);
		pEle = rng.commonAncestorContainer;
		ele = rng.cloneContents();
	} else {
		pEle = doc.documentElement;
		ele = (doc.body || doc.getElementsByTagName('body')[0]).cloneNode(true);
	};

	while (pEle) {
		if (pEle.nodeType == 1) {
			clone = pEle.cloneNode(false);
			clone.appendChild(ele);
			ele = clone;
		};
		pEle = pEle.parentNode
	};

	var sel = doc.createElement('div');
	sel.appendChild(ele);

	for (var el, all = sel.getElementsByTagName('*'), i = all.length; i--;) {
		el = all[i];
		if (el.style && el.style.backgroundImage) el.style.backgroundImage = el.style.backgroundImage.replace(reUrl, function (a, prev, url, next) {
			if (!/^[a-z]+:/.test(url)) url = resolveURL(url, loc.href);
			return prev + encodeImg(url) + next;
		});
		switch (el.nodeName.toLowerCase()) {
			case 'link':
			case 'style':
			case 'script': el.parentNode.removeChild(el); break;
			case 'a': 
			case 'area': if (el.hasAttribute('href') && el.getAttribute('href').charAt(0) != '#') el.href = el.href; break;
			case 'img':
			case 'input': if (el.hasAttribute('src')) el.src = encodeImg(el.src, el); break;
			case 'audio':
			case 'video':
			case 'embed':
			case 'frame':
			case 'iframe': if (el.hasAttribute('src')) el.src = el.src; break;
			case 'object': if (el.hasAttribute('data')) el.data = el.data; break;
			case 'form': if (el.hasAttribute('action')) el.action = el.action; break;
		}
	};

	var head = ele.insertBefore(doc.createElement('head'), ele.firstChild);
	var meta = doc.createElement('meta');
	meta.httpEquiv = 'content-type';
	meta.content = 'text/html; charset=utf-8';
	head.appendChild(meta);
	var title = doc.getElementsByTagName('title')[0];
	if (title) head.appendChild(title.cloneNode(true));

	head.copyScript = function (unsafeWin) {
		if ('$' in unsafeWin) return;
		var f = doc.createElement('iframe');
		f.src = 'about:blank';
		f.setAttribute('style', 'position:fixed;left:0;top:0;visibility:hidden;width:0;height:0;');
		doc.documentElement.appendChild(f);
		var str, script = doc.createElement('script');
		script.type = 'text/javascript';
		for (var name in unsafeWin) {
			if (name in f.contentWindow || !/^[a-zA-Z_$][0-9a-zA-Z_$]*$/.test(name)) continue;
			try {
				str = toSrc(unsafeWin[name]);
				if (!/\{\s*\[native code\]\s*\}/.test(str)) {
					script.appendChild(doc.createTextNode('var ' + name + ' = ' + str.replace(/<\/(script>)/ig, '<\\/$1') + ';\n'));
				}
			} catch (e) {};
		};
		f.parentNode.removeChild(f);
		if (script.childNodes.length) this.nextSibling.appendChild(script);
	};
	head.copyScript(win.wrappedJSObject || win);

	head.copyStyle = function (s) {
		if (!s) return;
		var style = doc.createElement('style');
		style.type = 'text/css';
		if (s.media && s.media.mediaText) style.media = s.media.mediaText;
		try {
			for (var i = 0, rule; rule = s.cssRules[i]; i++) {
				if (rule.type != 3) {
					if((!rule.selectorText || rule.selectorText.indexOf(':') != -1) || (!sel.querySelector || sel.querySelector(rule.selectorText))) {
						var css = !rule.cssText ? '' : rule.cssText.replace(reUrl, function (a, prev, url, next) {
							if (!/^[a-z]+:/.test(url)) url = resolveURL(url, s.href || loc.href);
							if(rule.type == 1 && rule.style && rule.style.backgroundImage) url = encodeImg(url);
							return prev + url + next;
						});
						style.appendChild(doc.createTextNode(css + '\n'));
					}
				} else {
					this.copyStyle(rule.styleSheet);
				}
			}
		} catch(e) {
			if (s.ownerNode) style = s.ownerNode.cloneNode(false);
		};
		this.appendChild(style);
	};

	var sheets = doc.styleSheets;
	for (var j = 0; j < sheets.length; j++) head.copyStyle(sheets[j]);
	head.appendChild(doc.createTextNode('\n'));

	var doctype = '', dt = doc.doctype;
	if (dt && dt.name) {
		doctype += '<!DOCTYPE ' + dt.name;
		if (dt.publicId) doctype += ' PUBLIC \x22' + dt.publicId + '\x22';
		if (dt.systemId) doctype += ' \x22' + dt.systemId + '\x22';
		doctype += '>\n';
	};

	var fileName = selWin ? win.getSelection().toString() : (title && title.text ? title.text : loc.pathname.split('/').pop());
	fileName = fileName.replace(/[:\\\/<>?*|"]+/g, '').replace(/[\.]+/ig, ' ').replace(/[\,]+/ig, ' ').replace(/\s+/g, '_').slice(0, 100).replace(/^\s+|\s+$/g, '');
	fileName += (function () {
		var d = new Date(), z = function(n){return (n < 10 ? '0' : '') + n};
		return '_' + '[' + z(d.getFullYear()) + '_' + z(d.getMonth()+1) + '_' + z(d.getDate()) + '\u2014' + z(d.getHours()) + '_' + z(d.getMinutes()) + '_' + z(d.getSeconds()) + ']';
	})();

	if(!/\.html?$/.test(fileName))fileName += '.html';

	sendAsyncMessage("%MSG_NAME%", [doctype + sel.innerHTML + '\n<!-- This document saved from ' + (loc.protocol != 'data:' ? loc.href : 'data:uri') + ' -->', fileName]);

});