Examine source code of Bronx Bombers

{
  "theme": {
    "images": {
      "theme_frame": "Yankee_Firefox_Header.jpg"
    },
    "colors": {
      "frame": "#0f0f0f",
      "tab_background_text": "#fafafa"
    }
  },
  "version": "2.0",
  "name": "Bronx Bombers",
  "manifest_version": 2,
  "description": "I shot an image of my New York Yankees hat and made this Firefox persona. \n\nEnjoy!"
}