title: firebase hosting iframe error with X-Frame-Options
body: <p>I need to use couple of iframe for a page hosted with firebase, but its giving me X-Frame-Options error, one of the iframe is for gallery hosted on picasa, and anohter ifrmae for contact form(because i couldnt sent email via firebase :()</p>
  
  <p>here is error</p>
  
  <pre><code>Refused to display 'https://get.google.com/albumarchive/pwa/11111/album/1111?source=pwa#slideshow/1111' in a frame because it set 'X-Frame-Options' to 'SAMEORIGIN'.
  jquery.min.js:2 Uncaught DOMException: Failed to read the 'contentDocument' property from 'HTMLIFrameElement': Blocked a frame with origin "https://demodomain.com" from accessing a cross-origin frame. 
  </code></pre>
  
  <p>i did this with firebase.json but didnt worked</p>
  
  <pre><code> "headers": [
       {
         "source": "**/*",
         "headers": [
           {"key": "X-Content-Type-Options", "value": "nosniff"},
           {"key": "X-Frame-Options", "value": "ALLOW"},
           {"key": "X-UA-Compatible", "value": "ie=edge"},
           {"key": "X-XSS-Protection", "value": "1; mode=block"}
         ]
       }
  ]
  </code></pre>