Examine source code of Cool (dark version)

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Cool (dark)",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-003-31b6bea3c78e3a19fd889b0389652a94.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(7, 50, 84)",
      "toolbar_text": "rgb(148, 238, 255)",
      "frame": "rgb(14, 41, 65)",
      "tab_background_text": "rgb(24, 156, 180)",
      "toolbar_field": "rgb(72, 38, 102)",
      "toolbar_field_text": "rgb(67, 194, 218)",
      "tab_line": "rgb(67, 194, 218)",
      "popup": "rgb(7, 50, 84)",
      "popup_text": "rgb(255, 255, 255)",
      "tab_loading": "rgb(67, 194, 218)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{fe449f28-295e-4aa7-9373-74ff94ed5d91}"
    }
  }
}