Examine source code of Koala Zen

{
  "manifest_version": 3,
  "name": "Koala Zen",
  "version": "1.0.9",
  "default_locale": "en",
  "description": "__MSG_extDesc__",
  "permissions": [
    "alarms",
    "idle",
    "storage",
    "tabs",
    "scripting",
    "unlimitedStorage"
  ],
  "host_permissions": [
    "http://*/*",
    "https://*/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "quotes.js",
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "images/*.png"
      ],
      "matches": [
        "http://*/*",
        "https://*/*"
      ]
    }
  ],
  "action": {
    "default_popup": "popup.html",
    "default_title": "Koala Zen",
    "default_icon": {
      "16": "icons/icon-16.png",
      "48": "icons/icon-48.png",
      "128": "icons/icon-128.png"
    }
  },
  "icons": {
    "16": "icons/icon-16.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "koala-zen@public.extension",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  }
}