Examine source code of Adva PowerTools

{
  "chrome_url_overrides": {
    "newtab": "newTabOverride.html"
  },
  "manifest_version": 3,
  "name": "Adva PowerTools | Versatile & Functional",
  "description": "Powerful chrome enhancement tools, from a versatile start page to customisable CSS injection into a site.",
  "browser_specific_settings": {
    "gecko": {
      "id": "advasoftware@outlook.com"
    }
  },
  "version": "2.0.4",
  "action": {
    "default_popup": "popup.html",
    "default_icon": "favicon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "DOMController.js"
      ],
      "run_at": "document_end"
    }
  ],
  "permissions": [
    "activeTab"
  ]
}