Examine source code of Close Original Tab

{
  "manifest_version": 2,
  "name": "&Quit Tab and Open in Container",
  "version": "0.0.1",
  "description": "Closes the original tab (or tabs) after opening in a selected container.",
  "homepage_url": "https://gitlab.com/cprn/firefox-close-original-tab",
  "permissions": [
    "tabs",
    "menus",
    "contextualIdentities",
    "cookies"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "strict_min_version": "114.0",
      "id": "{b5023ad3-291b-49fd-a66c-316af24d53d0}"
    }
  },
  "content_scripts": []
}