Examine source code of Neuronal Cluster

{
  "theme": {
    "images": {
      "theme_frame": "neuro_head2.jpg"
    },
    "colors": {
      "frame": "#2891c9",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Neuronal Cluster",
  "manifest_version": 2,
  "description": "3D image of a cluster of neurons."
}