Set the default text color to #333. Used in the addon so text is not white on white.

close #522

resources/static/dialog/css/popup.css

@@ -18,6 +18,7 @@ body {
     font-size: 13px;
     line-height: 21px;
     background-image: url('/i/bg.png');
+    color: #333;
 }