Examine source code of IFrame Changer

{
  "manifest_version": 2,
  "name": "IFrame changer",
  "version": "1.1.0",
  "description": "Simple changer on IFrame.",
  "icons": {
    "16": "icons/img.png",
    "32": "icons/img.png",
    "48": "icons/img.png",
    "128": "icons/img.png"
  },
  "permissions": [
    "storage",
    "webRequest",
    "webRequestBlocking",
    "webNavigation",
    "tabs",
    "<all_urls>"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/img.png",
      "32": "icons/img.png",
      "48": "icons/img.png",
      "128": "icons/img.png"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_start",
      "all_frames": true
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "iframe-changer@extension",
      "strict_min_version": "58.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}