Examine source code of sout's 16 theme

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "sout's 16 theme",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right center"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(199, 217, 226)",
      "toolbar_text": "rgb(56, 75, 125)",
      "frame": "rgb(97, 116, 128)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(238, 247, 251)",
      "toolbar_field_text": "rgb(44, 91, 98)",
      "tab_line": "rgb(129, 207, 255)",
      "popup": "rgb(240, 250, 255)",
      "popup_text": "rgb(47, 49, 77)",
      "tab_loading": "rgb(129, 207, 255)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{dd6ed367-a471-4e25-842a-df4ad4a23ce6}"
    }
  }
}