Examine source code of scenecore rainbow dark

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "OMG!! *_*",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(0, 0, 0)",
      "toolbar_text": "rgb(248, 112, 140)",
      "frame": "rgb(0, 0, 0)",
      "tab_background_text": "rgb(153, 88, 88)",
      "toolbar_field": "rgb(0, 0, 0)",
      "toolbar_field_text": "rgb(248, 112, 140)",
      "tab_line": "rgb(248, 112, 140)",
      "popup": "rgb(0, 0, 0)",
      "popup_text": "rgb(248, 112, 140)",
      "icons_attention": "rgb(248, 191, 112)",
      "icons": "rgb(248, 112, 140)",
      "ntp_background": "rgb(0, 0, 0)",
      "ntp_text": "rgb(248, 112, 140)",
      "popup_border": "rgb(248, 112, 140)",
      "popup_highlight": "rgb(248, 112, 140)",
      "tab_loading": "rgb(248, 112, 140)",
      "tab_text": "rgb(248, 112, 140)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{57e1ac8a-c357-43a3-bbb1-5c286196a087}"
    }
  }
}