Examine source code of TabCloser

{
  "manifest_version": 3,
  "name": "TabCloser",
  "version": "4.3.0",
  "description": "Automatically close leftover tabs from services like Figma, Spotify, Zoom and other commonly redirected URLs.",
  "permissions": [
    "tabs",
    "storage"
  ],
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "images/icon16.png",
      "48": "images/icon48.png",
      "128": "images/icon128.png"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "options_page": "options.html",
  "icons": {
    "16": "images/icon16.png",
    "48": "images/icon48.png",
    "128": "images/icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "tabcloser@sethcottle.com",
      "strict_min_version": "121.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  }
}