Examine source code of Dark Green Topography

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Dark Green Topography",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center top"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(43, 44, 35)",
      "toolbar_text": "rgb(224, 227, 187)",
      "frame": "rgb(17, 22, 5)",
      "tab_background_text": "rgb(137, 138, 121)",
      "toolbar_field": "rgb(55, 56, 48)",
      "toolbar_field_text": "rgb(224, 227, 187)",
      "tab_line": "rgb(75, 77, 56)",
      "popup": "rgb(43, 44, 35)",
      "popup_text": "rgb(224, 227, 187)",
      "tab_loading": "rgb(75, 77, 56)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{f7472527-8285-475a-b54e-cca9d2d76c63}"
    }
  }
}