Examine source code of Blue_snake

{
  "theme": {
    "images": {
      "theme_frame": "snake_1.JPG"
    },
    "colors": {
      "frame": "#3ae61c",
      "tab_background_text": "#fafa0f"
    }
  },
  "version": "2.0",
  "name": "Blue_snake",
  "manifest_version": 2,
  "description": "Blue Snake"
}