Examine source code of cacheAll

{
  "manifest_version": 3,
  "name": "cacheAll",
  "version": "2.0.0",
  "description": "Save web pages as HTML with an on/off toggle indicator",
  "icons": {
    "48": "icons/icon-48.svg"
  },
  "permissions": [
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "action": {
    "default_popup": "popup.html",
    "default_title": "cacheAll"
  },
  "options_page": "options.html",
  "browser_specific_settings": {
    "gecko": {
      "id": "cacheall@dev.example.com",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      },
      "gecko_android": {}
    }
  }
}