Examine source code of GT Page Protect

{
  "manifest_version": 2,
  "name": "GT Page Protect",
  "version": "1.0.1",
  "description": "Protege paginas com overlay e senha",
  "permissions": [
    "storage",
    "activeTab",
    "tabs",
    "webNavigation",
    "webRequest",
    "webRequestBlocking",
    "<all_urls>"
  ],
  "browser_action": {
    "default_icon": "icons/icon128.png",
    "default_popup": "popup/popup.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "web_accessible_resources": [
    "settings.html",
    "settings.js",
    "content.js",
    "icons/logo.png",
    "icons/icon.png"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "gt-page-protect@gt.com",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}