Examine source code of Gbro

{
  "manifest_version": 3,
  "name": "Gbro",
  "short_name": "Gbro",
  "version": "2.1.2",
  "description": "Gbro — high-performance text expansion that works everywhere you can type",
  "permissions": [
    "storage"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "action": {
    "default_title": "Gbro",
    "default_popup": "popup.html"
  },
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "offline_enabled": true,
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'none'; base-uri 'none';"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "gbro@chanak.dev"
    }
  }
}