Examine source code of Whaleshark

{
  "theme": {
    "images": {
      "theme_frame": "whale-personas.jpg"
    },
    "colors": {
      "frame": "#f2eded",
      "tab_background_text": "#f2eded"
    }
  },
  "version": "2.0",
  "name": "Whaleshark",
  "manifest_version": 2,
  "description": "Whalesharks are the biggest fish in our oceans ... they are unbelievable beautiful ... the picture of this one was taken in the Red Sea ..."
}