diff --git a/canvasblocker.xpi b/canvasblocker.xpi
index 383e547..b3c17ce 100644
Binary files a/canvasblocker.xpi and b/canvasblocker.xpi differ
diff --git a/lib/sharedFunctions.js b/lib/sharedFunctions.js
index 945658f..bf2a27d 100644
--- a/lib/sharedFunctions.js
+++ b/lib/sharedFunctions.js
@@ -35,8 +35,13 @@ function check(stack, url, blockMode){
 function checkURL(url, blockMode){
 	"use strict";
 	
-	if (url.protocol === "about:" || url.protocol === "chrome:") {
-		return "allow";
+	switch (url.protocol){
+		case "about:":
+			if (url.href === "about:blank"){
+				break;
+			}
+		case "chrome:":
+			return "allow";
 	}
 	
 	var mode = "block";