Examine source code of FamilyLink

{
  "manifest_version": 2,
  "name": "FamilyLink",
  "version": "1.2.0",
  "description": "Securely share browsing sessions with family.",
  "icons": {
    "48": "circle/link.svg"
  },
  "permissions": [
    "storage",
    "tabs",
    "notifications",
    "<all_urls>"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "YettaCelli2622@outlook.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "background": {
    "scripts": [
      "bond/hub.js",
      "kin/gate.js"
    ],
    "persistent": true
  },
  "browser_action": {
    "default_title": "FamilyLink",
    "default_popup": "trust/control.html"
  },
  "options_ui": {
    "page": "circle/roster.html",
    "open_in_tab": true
  }
}