Examine source code of Local Session Sync

{
  "manifest_version": 3,
  "name": "Local Session Sync",
  "version": "1.2.4",
  "description": "Recreate authenticated sessions on localhost from dev, stage, UAT, and production tabs.",
  "author": "artinski",
  "homepage_url": "https://local-session-sync.artinski.dev/",
  "permissions": [
    "cookies",
    "activeTab",
    "contextMenus",
    "storage"
  ],
  "host_permissions": [
    "http://localhost/*",
    "https://localhost/*",
    "https://127.0.0.1/*"
  ],
  "optional_host_permissions": [
    "http://*/*",
    "https://*/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_title": "Local Session Sync",
    "default_popup": "popup.html"
  },
  "icons": {
    "16": "icons/16.png",
    "32": "icons/32.png",
    "48": "icons/48.png",
    "128": "icons/128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "local-session-sync@artinski.dev",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}