Examine source code of neopets gormball

{
  "name": "gormball",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "Untitled-1.png"
    },
    "colors": {
      "frame": "rgba(116, 211, 0, 1)",
      "tab_background_text": "rgba(0, 0, 0, 1)",
      "tab_line": "rgba(250, 0, 0, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{cecb53df-0be0-480c-9815-0f66a436191a}"
    }
  }
}