Examine source code of Tree with moss

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Tree with moss",
  "manifest_version": 2,
  "description": "Nice photo with a moss on a tree can be a nice theme for your browser when you want to browse calmly!\n<b> Good for calm people </b>"
}