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reblogcommand.user.js このあたりかな?

	function convertToHTMLDocument(html) {
		var xsl = (new DOMParser()).parseFromString(
			'<?xml version="1.0"?>\
				<stylesheet version="1.0" xmlns="http://www.w3.org/1999/XSL/Transform">\
				<output method="html"/>\
			</stylesheet>', "text/xml");
		var xsltp = new XSLTProcessor();
		xsltp.importStylesheet(xsl);
		var doc = xsltp.transformToDocument(document.implementation.createDocument("", "", null));
		doc.appendChild(doc.createElement("html"));
		var range = doc.createRange();
		range.selectNodeContents(doc.documentElement);
		doc.documentElement.appendChild(range.createContextualFragment(html));
		return doc;
	}

	function parseParams(doc) {
		var elms = $X('id("edit_post")//*[name()="INPUT" or name()="TEXTAREA" or name()="SELECT"]', doc);
		var params = {};
		elms.forEach(function(elm) {
			params[elm.name] = elm.value;
		});
		return params;
	}

	function createPostData(params) {
		var arr = [];
		for (var param in params) {
			if (param != "preview_post") {
				arr.push(encodeURIComponent(param));
				arr.push("=");
				arr.push(encodeURIComponent(params[param]));
				arr.push("&");
			}
		}
		return arr.join('');
	}
	function reblog(aURL) {
		var id = getIDByPermalink(aURL);
		var d;
		with (D()) {
			d = Deferred();
			if (!id) {
				wait(0).next(function() { d.call(); });
				return d;
			}
		}
		window.Minibuffer.status('ReblogCommand'+id, 'Reblog ...');
		d = D();
		var url = aURL;
		d.xhttp.get(url).
		next(function(res) {
			var token = getReblogToken(res.responseText.match('iframe src="((?:\\"|[^"])*)"')[1]);
			url = getURLByID(token.id, token.token);
			return d.xhttp.get(url);
		}).
		next(function(res) {
			return d.xhttp.post(url, createPostData( parseParams( convertToHTMLDocument(res.responseText))));
		}).
		next(function() { window.Minibuffer.status('ReblogCommand'+id, 'Reblog ... done.', 100); d.call()}).
		error(function() {
			if (confirm('reblog manually ? \n' + url)) reblogManually(url);
			d.call();
		});
		return d;
	}