Examine source code of DOM Element Counter

{
  "manifest_version": 3,
  "name": "DOM Element Counter",
  "short_name": "DOM Element ",
  "version": "1.0.0",
  "description": "Page performance degrades with DOM size. This panel shows exactly where the bloat is — which tags appear most, how deep the tree goe",
  "author": "ForgeX",
  "permissions": [
    "activeTab",
    "storage",
    "scripting"
  ],
  "host_permissions": [
    "http://*/*",
    "https://*/*"
  ],
  "background": {
    "type": "module",
    "scripts": [
      "background/service-worker.js"
    ]
  },
  "action": {
    "default_popup": "popup/popup.html",
    "default_title": "DOM Element Counter",
    "default_icon": {
      "16": "icons/icon16.png",
      "32": "icons/icon32.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "content/content.js"
      ],
      "run_at": "document_idle",
      "all_frames": false
    }
  ],
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self'"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "dom_element_counter@forgex.aevorn",
      "strict_min_version": "109.0"
    }
  }
}