title: Prototype is restricted in Firefox 67
body: <p>Since Firefox version 67, users can't access the system I'm working on due to errors thrown when trying to access some variables.</p>
  
  <p><a href="https://i.stack.imgur.com/GyhQN.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/GyhQN.png" alt="Error we receive whenever we try to clone"></a></p>
  
  <p>the Learn more links to <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Errors/Property_access_denied" rel="nofollow noreferrer">here</a></p>
  
  <p>As you can see, lodash clone is failing when trying to access property type of given object.
  I also noticed prototype is Restricted for the object.</p>
  
  <p>The object is received from a function that is exposed in an object that is being received from an iFrame inside the website (the object is exposed via onMessageReceived...)</p>
  
  <p>Anyone is experiencing anything similar?
  Any clue how can I fix this bug?</p>