Examine source code of Close web Tabs

{
  "manifest_version": 3,
  "name": "Close Other Tabs",
  "version": "1.0",
  "description": "Closes all other tabs except the current one.",
  "browser_specific_settings": {
    "gecko": {
      "id": "closetabs@amazon.com",
      "strict_min_version": "109.0"
    }
  },
  "action": {
    "default_icon": "x.png",
    "default_title": "Close Other Tabs"
  },
  "permissions": [
    "tabs"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "type": "module"
  }
}