Examine source code of ReTab - Tab Snoozer

{
  "manifest_version": 3,
  "name": "ReTab - Tab Snoozer",
  "version": "1.0.6",
  "description": "Snooze, schedule, and manage tabs to reopen automatically - once or on a recurring schedule. Declutter your browser without losing track of important pages.",
  "browser_specific_settings": {
    "gecko": {
      "id": "retab@richwilson.me",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "alarms",
    "contextMenus",
    "storage",
    "tabs"
  ],
  "action": {
    "default_popup": "src/popup/popup.html",
    "default_icon": {
      "16": "icons/icon-16.png",
      "32": "icons/icon-32.png",
      "48": "icons/icon-48.png",
      "128": "icons/icon-128.png"
    },
    "default_title": "Snooze this tab"
  },
  "background": {
    "scripts": [
      "service-worker.js"
    ],
    "type": "module"
  },
  "commands": {
    "_execute_action": {
      "suggested_key": {
        "default": "Alt+Shift+R",
        "mac": "Alt+Shift+R"
      },
      "description": "Open snooze menu for current tab"
    }
  },
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  }
}