Issue 370 - Right-clicked element is removed independent of created filter

lib/basedomain.js

Index: lib/basedomain.js
===================================================================
--- a/lib/basedomain.js
+++ b/lib/basedomain.js
@@ -158,6 +158,30 @@
 }
 
 /**
+ * Extracts host name from the URL of the given frame. If the URL don't have host
+ * information (like about:blank or data: URLs) it falls back to the parent frame.
+ */
+function extractHostFromFrame(frame)
+{
+  var host = extractHostFromURL(frame.url);
+  if (!host)
+  {
+    var parentFrame = frame.parent;
+    if (parentFrame)
+      return extractHostFromFrame(parentFrame);
+  }
+  return host;
+}
+
+/**
+ * Strips the fragment from a URL.
+ */
+function stripFragmentFromURL(/**String*/ url)
+{
+  return url.replace(/#.*/, "");
+}
+
+/**
  * Parses URLs and provides an interface similar to nsIURI in Gecko, see
  * https://developer.mozilla.org/en-US/docs/XPCOM_Interface_Reference/nsIURI.
  * TODO: Make sure the parsing actually works the same as nsStandardURL.