Examine source code of Baseball in the corner

{
  "theme": {
    "images": {
      "theme_frame": "baseball_head.jpg"
    },
    "colors": {
      "frame": "#0d00ff",
      "tab_background_text": "#0011ff"
    }
  },
  "version": "2.0",
  "name": "Baseball in the corner",
  "manifest_version": 2,
  "description": "Baseball in the corner"
}