diff --git a/chrome/content/zotero/xpcom/http.js b/chrome/content/zotero/xpcom/http.js
index 67e7cccfb0..3635bcb603 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;
@@ -94,34 +99,20 @@ Zotero.HTTP = new function() {
 			return false;
 		}
 		
-		// Workaround for "Accept third-party cookies" being off in Firefox 3.0.1
-		// https://www.zotero.org/trac/ticket/1070
-		if (Zotero.isFx30) {
-			const Cc = Components.classes;
-			const Ci = Components.interfaces;
-			var ds = Cc["@mozilla.org/webshell;1"].
-						createInstance(Components.interfaces.nsIDocShellTreeItem).
-						QueryInterface(Ci.nsIInterfaceRequestor);
-			ds.itemType = Ci.nsIDocShellTreeItem.typeContent;
-			var xmlhttp = Cc["@mozilla.org/xmlextras/xmlhttprequest;1"].
-							createInstance(Ci.nsIXMLHttpRequest);
-			xmlhttp.mozBackgroundRequest = true;
-			xmlhttp.open("POST", url, true);
-			xmlhttp.channel.loadGroup = ds.getInterface(Ci.nsILoadGroup);
-			xmlhttp.channel.loadFlags |= Ci.nsIChannel.LOAD_DOCUMENT_URI;
-		}
-		else {
-			var xmlhttp = Components.classes["@mozilla.org/xmlextras/xmlhttprequest;1"]
-						.createInstance();
-			// Prevent certificate/authentication dialogs from popping up
-			xmlhttp.mozBackgroundRequest = true;
-			xmlhttp.open('POST', url, true);
-			// Send cookie even if "Allow third-party cookies" is disabled (>=Fx3.6 only)
-			if (!Zotero.isFx35) {
-				var channel = xmlhttp.channel;
-				channel.QueryInterface(Components.interfaces.nsIHttpChannelInternal);
-				channel.forceAllowThirdPartyCookie = true;
-			}
+		var xmlhttp = Components.classes["@mozilla.org/xmlextras/xmlhttprequest;1"]
+					.createInstance();
+		// Prevent certificate/authentication dialogs from popping up
+		xmlhttp.mozBackgroundRequest = true;
+		xmlhttp.open('POST', url, true);
+	
+		// Send cookie even if "Allow third-party cookies" is disabled (>=Fx3.6 only)
+		var channel = xmlhttp.channel;
+		channel.QueryInterface(Components.interfaces.nsIHttpChannelInternal);
+		channel.forceAllowThirdPartyCookie = true;
+		
+		// Set charset
+		if (responseCharset) {
+			channel.contentCharset = responseCharset;
 		}
 		
 		if (headers) {