Bug fix

Author: Timothy Johnson

dest/content.js

@@ -4,7 +4,7 @@
   document.body.appendChild(tag)
 
   const port = chrome.runtime.connect()
-  port.onMessage.addListener(window.postMessage)
+  port.onMessage.addListener(window.postMessage.bind(window))
   window.addEventListener(
     'message',
     e => e.source == window && port.postMessage(e.data),