Your browser does not seem to support JavaScript. As a result, your viewing experience will be diminished, and you have been placed in read-only mode.
Please download a browser that supports JavaScript, or enable it if it's disabled (i.e. NoScript).
In case anyone is interested I created a module for it and submitted a pull request to @zerojay's retropie extra repository:
https://github.com/zerojay/RetroPie-Extra/pull/184
I only tested on my pc but it should work on the pi too.