Examine source code of AWS Tab Closer

{
  "manifest_version": 3,
  "name": "AWS Tab Closer",
  "version": "1.1.8",
  "description": "Automatically closes tabs opened by AWS CLI login and AWS VPN",
  "author": "ysheikh2",
  "homepage_url": "https://github.com/ysheikh2/aws-tab-closer",
  "browser_specific_settings": {
    "gecko": {
      "id": "{493d1461-308e-4161-9cec-6e8e8c065dd1}",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "type": "module"
  },
  "content_scripts": [
    {
      "matches": [
        "http://127.0.0.1/*",
        "http://localhost/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "permissions": [],
  "host_permissions": []
}