Examine source code of Cool Dark Green

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Murky",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(10, 10, 10)",
      "toolbar_text": "rgb(116, 128, 116)",
      "frame": "rgb(10, 10, 10)",
      "tab_background_text": "rgb(131, 147, 131)",
      "toolbar_field": "rgb(21, 22, 23)",
      "toolbar_field_text": "rgb(127, 192, 129)",
      "tab_line": "rgb(11, 12, 12)",
      "popup": "rgb(31, 31, 34)",
      "popup_text": "rgb(151, 178, 153)",
      "tab_loading": "rgb(11, 12, 12)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{78798080-26f9-46ec-944b-fc2009757cf7}"
    }
  }
}