Examine source code of Dark Ocean

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Dark Ocean",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png",
        "images/1.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top",
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "repeat-y",
        "repeat-x"
      ]
    },
    "colors": {
      "toolbar": "rgba(0, 0, 0, 0.32)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(0, 6, 19)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgba(0, 0, 0, 0.57)",
      "toolbar_field_text": "rgba(255, 255, 255, 0.54)",
      "tab_line": "rgb(255, 255, 255)",
      "popup": "rgba(0, 0, 0, 0.69)",
      "popup_text": "rgb(255, 255, 255)",
      "tab_loading": "rgb(255, 255, 255)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{c04b53ea-aadc-4d98-a71f-1b441ddd4bf5}"
    }
  }
}