Examine source code of Auto Tab Sleeper

{
  "manifest_version": 2,
  "name": "Auto Tab Sleeper",
  "version": "1.0.6",
  "description": "Automatically discards inactive tabs and keeps only the current tab active to save memory.",
  "permissions": [
    "tabs"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "auto-tab-sleeper@yourname",
      "strict_min_version": "91.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "collects_personal_data": false,
        "collects_location": false,
        "collects_health_data": false,
        "collects_financial_data": false,
        "collects_authentication_info": false,
        "collects_user_activity": false,
        "collects_website_content": false
      }
    }
  }
}