Examine source code of Ultimate Tab Limiter

{
  "manifest_version": 3,
  "name": "Ultimate Tab Limiter",
  "version": "1.0.0",
  "description": "Allows users to customize how many tabs they want per domain and allows them to select the closing behavior",
  "icons": {
    "16": "icons/16px.png",
    "32": "icons/32px.png"
  },
  "permissions": [
    "storage",
    "tabs"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "action": {
    "default_icon": {
      "16": "icons/16px.png",
      "32": "icons/32px.png"
    },
    "default_title": "Click to configure"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "cal1br@ultimate-tab-limiter",
      "strict_min_version": "109.0"
    },
    "gecko_android": {
      "id": "cal1br@ultimate-tab-limiter",
      "strict_min_version": "109.0"
    }
  }
}