Examine source code of Memory Story Helper

{
  "manifest_version": 2,
  "name": "Memory Story Helper",
  "version": "1.0.0",
  "description": "Sends active tab URL/title to the Memory Story Mac app (local only).",
  "homepage_url": "https://kobyofek.com/memory-story",
  "permissions": [
    "tabs",
    "http://127.0.0.1:18765/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "memorystory-helper@memorystory.app",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "browsingActivity"
        ]
      }
    }
  }
}