Examine source code of Gmail One-Click Cleaner x

{
  "manifest_version": 3,
  "name": "Gmail One-Click Cleaner - Bulk Delete Emails",
  "short_name": "Gmail Cleaner",
  "version": "7.8.0",
  "version_name": "7.8.0 - Smart Suggestions",
  "description": "Free up Gmail storage fast. Bulk delete old emails, large attachments & promos. Bulk unsubscribe from lists, schedules & undo.",
  "permissions": [
    "activeTab",
    "scripting",
    "tabs",
    "storage",
    "alarms",
    "notifications"
  ],
  "host_permissions": [
    "https://mail.google.com/*"
  ],
  "background": {
    "scripts": [
      "browser-polyfill.js",
      "background.js"
    ]
  },
  "action": {
    "default_popup": "popup.html",
    "default_title": "Gmail One-Click Cleaner",
    "default_icon": {
      "16": "icons/icon16.png",
      "32": "icons/icon32.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'none'"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{df1f81c7-55c8-4d22-b6e5-3df6810df28d}",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  }
}