Examine source code of Miku Dance

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Miku Dance",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(16, 47, 65)",
      "toolbar_text": "rgb(9, 186, 253)",
      "frame": "rgb(16, 47, 65)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(16, 70, 92)",
      "toolbar_field_text": "rgb(88, 251, 255)",
      "tab_line": "rgb(9, 186, 253)",
      "popup": "rgb(16, 47, 65)",
      "popup_text": "rgb(9, 186, 253)",
      "button_background_active": "rgb(43, 116, 146)",
      "frame_inactive": "rgb(0, 71, 101)",
      "icons_attention": "rgb(255, 0, 138)",
      "ntp_background": "rgb(16, 47, 65)",
      "ntp_text": "rgb(0, 181, 255)",
      "popup_highlight_text": "rgb(255, 0, 138)",
      "popup_highlight": "rgb(255, 0, 138)",
      "sidebar_highlight_text": "rgb(255, 0, 138)",
      "tab_loading": "rgb(9, 186, 253)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{ecc54281-a9cc-4519-9054-b185f17383f6}"
    }
  }
}