Examine source code of Minecraft Legends

{
  "name": "Minecraft Legends",
  "version": "1.0",
  "manifest_version": 2,
  "description": "Minecraft Legends Chrome",
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "browser_action": {
    "default_icon": {
      "16": "icons/icon16.png",
      "32": "icons/icon32.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    },
    "default_popup": "popup.html"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{86375f65-7269-4ce2-830a-18f7d8f36e97}"
    }
  }
}