Examine source code of Cat Walk

{
  "theme": {
    "images": {
      "theme_frame": "catwalk.jpg"
    },
    "colors": {
      "frame": "#dea738",
      "tab_background_text": "#d93030"
    }
  },
  "version": "2.0",
  "name": "Cat Walk",
  "manifest_version": 2,
  "description": "All original kitten pictures by courtesy  of Dr. Annett Stange, manager of the animal shelter \"Tierschutzliga-Dorf\" (<a href=\"https://outgoing.prod.mozaws.net/v1/b40a8bc6ee3af59ac7d0faa3de87de01283fd77103135656a8e0de4ff576da84/http%3A//www.tierschutzligadorf.de\" rel=\"nofollow\">www.tierschutzligadorf.de</a>)\n\nMany many cats and kittens are waiting for a new home!"
}