Examine source code of No More IPv6 Requests

{
  "manifest_version": 2,
  "name": "No More IPv6 Requests",
  "version": "1.0",
  "description": "No More IPv6 network requests.",
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "<all_urls>",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": "icons/icon-64.png",
    "default_title": "No More IPv6 Requests",
    "default_popup": "popup.html"
  },
  "icons": {
    "64": "icons/icon-64.png",
    "128": "icons/icon-128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{f28d4f24-2dd6-430c-9205-f3a107396cf6}",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      },
      "strict_min_version": "89.0"
    }
  }
}