diff --git a/chrome/content/zotero/xpcom/http.js b/chrome/content/zotero/xpcom/http.js
index c1ae6612d5..8ad933cadc 100644
--- a/chrome/content/zotero/xpcom/http.js
+++ b/chrome/content/zotero/xpcom/http.js
@@ -43,6 +43,11 @@ Zotero.HTTP = new function() {
 		var channel = xmlhttp.channel;
 		channel.QueryInterface(Components.interfaces.nsIHttpChannelInternal);
 		channel.forceAllowThirdPartyCookie = true;
+		
+		// Set charset
+		if (responseCharset) {
+			channel.contentCharset = responseCharset;
+		}
 	
 		// Don't cache GET requests
 		xmlhttp.channel.loadFlags |= Components.interfaces.nsIRequest.LOAD_BYPASS_CACHE;
@@ -104,6 +109,11 @@ Zotero.HTTP = new function() {
 		channel.QueryInterface(Components.interfaces.nsIHttpChannelInternal);
 		channel.forceAllowThirdPartyCookie = true;
 		
+		// Set charset
+		if (responseCharset) {
+			channel.contentCharset = responseCharset;
+		}
+		
 		if (headers) {
 			if (typeof headers == 'string') {
 				var msg = "doPost() now takes a headers object rather than a requestContentType -- update your code";
diff --git a/chrome/content/zotero/xpcom/translation/translate_firefox.js b/chrome/content/zotero/xpcom/translation/translate_firefox.js
index 0700cf9d89..2206a970e3 100644
--- a/chrome/content/zotero/xpcom/translation/translate_firefox.js
+++ b/chrome/content/zotero/xpcom/translation/translate_firefox.js
@@ -402,9 +402,16 @@ Zotero.Translate.SandboxManager = function(sandboxLocation) {
 				this.parseFromString = function(str, contentType) _DOMParser.parseFromString(str, contentType);
 			}
 		}
-	}
+	};
 	this.sandbox.DOMParser.__exposedProps__ = {"prototype":"r"};
 	this.sandbox.DOMParser.prototype = {};
+	this.sandbox.XMLSerializer = function() {
+		var s = Components.classes["@mozilla.org/xmlextras/xmlserializer;1"]
+			.createInstance(Components.interfaces.nsIDOMSerializer);
+		this.serializeToString = function(doc) {
+			return s.serializeToString(Zotero.Translate.DOMWrapper.unwrapIfWrapped(doc));
+		};
+	};
 }
 
 Zotero.Translate.SandboxManager.prototype = {