Examine source code of my lonely tree

{
  "theme": {
    "images": {
      "theme_frame": "lonely-tree-up.jpg"
    },
    "colors": {
      "frame": "#ffffff",
      "tab_background_text": "#000099"
    }
  },
  "version": "2.0",
  "name": "my lonely tree",
  "manifest_version": 2,
  "description": "un arbre solitaire"
}