Examine source code of Minecraft Obsidian

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Minecraft Obsidian",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-013-06591d4ad28ab7b9ee90f62f81d6b505.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(27, 0, 29)",
      "toolbar_text": "rgb(255, 96, 0)",
      "frame": "rgb(20, 0, 22)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(57, 19, 62)",
      "toolbar_field_text": "rgb(255, 96, 0)",
      "tab_line": "rgb(255, 96, 0)",
      "popup": "rgb(20, 0, 34)",
      "popup_text": "rgb(98, 102, 183)",
      "ntp_background": "rgb(27, 0, 29)",
      "ntp_text": "rgb(255, 255, 255)",
      "popup_border": "rgb(172, 0, 255)",
      "tab_loading": "rgb(255, 96, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{ff145464-e2fc-41a7-a138-d69145598274}"
    }
  }
}