Examine source code of strolling painting

{
  "theme": {
    "images": {
      "theme_frame": "strollingpainting.jpg"
    },
    "colors": {
      "frame": "#548ef2",
      "tab_background_text": "#f7f7f7"
    }
  },
  "version": "2.0",
  "name": "strolling painting",
  "manifest_version": 2,
  "description": "a painting of two people strolling in the park"
}