Examine source code of GTM Parser

{
  "manifest_version": 2,
  "name": "GTM Parser",
  "version": "1.5",
  "description": "Parse the GTM container from the page and watch what exactly includes GTM on this page",
  "browser_action": {
    "default_popup": "popup.html"
  },
  "permissions": [
    "<all_urls>",
    "tabs",
    "activeTab"
  ],
  "icons": {
    "32": "./img/favicon-32x32.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{1bdb87f7-abf0-4da9-a750-b8ae8f13b9e5}"
    }
  }
}