Examine source code of Clean Web Extension

{
  "manifest_version": 2,
  "name": "Clean Web Extension",
  "version": "1.0",
  "description": "Removes sticky menus, footers, and annoying cookie banners for a cleaner and distraction-free browsing experience.",
  "icons": {
    "48": "icon.png"
  },
  "permissions": [
    "activeTab",
    "storage"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "run_at": "document_end"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{3a66748e-823f-47e6-acfc-d6038a5a9d43}"
    }
  }
}