Examine source code of Astro Boy logo

{
  "theme": {
    "images": {
      "theme_frame": "BrowserHeadlinerAstroBoy3.jpg"
    },
    "colors": {
      "frame": "#fcfcfc",
      "tab_background_text": "#fcfcfc"
    }
  },
  "version": "2.0",
  "name": "Astro Boy logo",
  "manifest_version": 2,
  "description": "I created for fun and to make a really simple version of it"
}