Examine source code of cool gray

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "cool gray",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-001-9c6d74e14860e77ee6f8f43e824bff25.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(82, 109, 130)",
      "toolbar_text": "rgb(221, 230, 237)",
      "frame": "rgb(39, 55, 77)",
      "tab_background_text": "rgb(221, 230, 237)",
      "toolbar_field": "rgb(157, 178, 191)",
      "toolbar_field_text": "rgb(39, 55, 77)",
      "tab_line": "rgba(255, 255, 255, 0)",
      "popup": "rgb(39, 55, 77)",
      "popup_text": "rgb(221, 230, 237)",
      "icons_attention": "rgb(255, 255, 255)",
      "icons": "rgb(189, 204, 216)",
      "ntp_background": "rgb(157, 178, 191)",
      "ntp_text": "rgb(50, 79, 111)",
      "popup_border": "rgba(255, 0, 0, 0)",
      "popup_highlight_text": "rgb(221, 230, 237)",
      "popup_highlight": "rgb(82, 109, 130)",
      "sidebar_border": "rgba(141, 11, 11, 0)",
      "toolbar_bottom_separator": "rgb(82, 109, 130)",
      "toolbar_field_border_focus": "rgb(118, 155, 182)",
      "tab_loading": "rgba(255, 255, 255, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{560850e1-8e31-4f22-b19b-478450495325}"
    }
  }
}