Examine source code of Asuka's Melancholy

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Asuka's Melancholy",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center center"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(185, 41, 21)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(38, 44, 51)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(11, 13, 15)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgba(48, 25, 30, 0)",
      "popup": "rgb(38, 44, 51)",
      "popup_text": "rgb(255, 255, 255)",
      "tab_loading": "rgba(48, 25, 30, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{c59407ad-bfb6-4df8-bb27-eb51a5322b17}"
    }
  }
}