Examine source code of Hearts Pattern Paper

{
  "name": "Hearts Pattern Paper",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "Hearts Pattern Paper.jpg"
    },
    "colors": {
      "frame": "rgba(126, 155, 224, 1)",
      "tab_background_text": "rgba(0, 0, 0, 1)",
      "toolbar": "rgba(0, 238, 255, 1)",
      "toolbar_field": "rgba(36, 240, 255, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{16c92df4-361f-4498-a220-ddcf399972b8}"
    }
  }
}