Examine source code of One Piece Characters

{
  "theme": {
    "images": {
      "theme_frame": "FirefoxCustomTheme.jpg"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#9dff00"
    }
  },
  "version": "2.0",
  "name": "One Piece Characters",
  "manifest_version": 2,
  "description": "Turn your Firefox into One Piece anime themes! Share with your friend and even anime fan of your cousin."
}