Tor Browser now lacks Page Info Media tab?

Click on the favicon in your iceweasel or non-TorBrowser FF31, and select 'more information', and there's a tab called 'Media' that tells you about the images, etc on that page.

Try that on Tor Browser and the Media is missing.

What's up with this?

Reported at https://blog.torproject.org/blog/tor-browser-40-released#comment-77063

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information