Examine source code of Cloud em Bookmarks

{
  "manifest_version": 3,
  "name": "Bookmarks Cloud",
  "version": "1.0.7",
  "action": {
    "default_popup": "index.html",
    "default_title": "Bookmarks Cloud",
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "permissions": [
    "activeTab",
    "bookmarks"
  ],
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{438a1077-fc5c-4739-b51b-858a2eba55c5}"
    }
  }
}