Examine source code of Midnight smoke

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Midnight smoke",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center center"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(115, 83, 186)",
      "toolbar_text": "rgb(239, 195, 245)",
      "frame": "rgb(47, 25, 95)",
      "tab_background_text": "rgb(250, 166, 255)",
      "toolbar_field": "rgb(250, 166, 255)",
      "toolbar_field_text": "rgb(115, 83, 186)",
      "tab_line": "rgb(15, 16, 32)",
      "popup": "rgb(47, 25, 95)",
      "popup_text": "rgb(250, 166, 255)",
      "ntp_background": "rgb(15, 16, 32)",
      "ntp_text": "rgb(239, 195, 245)",
      "popup_border": "rgb(115, 83, 186)",
      "toolbar_field_border": "rgb(15, 16, 32)",
      "toolbar_field_highlight": "rgb(47, 25, 95)",
      "tab_loading": "rgb(15, 16, 32)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{3fd4543a-0d8e-469d-90d8-e1fa493b838e}"
    }
  }
}