Pinterest "pin fetching" broken by Pinterest ruleset.

Pinterest does not work in TBB 2.3.25-2 (I assume it doesn't work in any of the previous versions either). To reproduce:

• Go to http://pinterest.com/
• Click on an image to view it up close
• Wait
• See message: "Could not fetch pin :-/"

The site is supposed to allow you to click on the image to be redirected to whatever site is hosting the article/recipe/post/etc that it links to.