Examine source code of Website Launch Reminder

{
  "manifest_version": 3,
  "name": "__MSG_extensionName__",
  "version": "0.51",
  "description": "__MSG_extensionDescription__",
  "icons": {
    "128": "icons/icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "TabManagementTimer12345@example.org",
      "strict_min_version": "115.0"
    }
  },
  "action": {
    "default_title": "__MSG_extensionName__",
    "default_area": "navbar",
    "default_icon": {
      "128": "icons/icon128.png"
    }
  },
  "permissions": [
    "storage",
    "alarms",
    "tabs"
  ],
  "optional_permissions": [
    "bookmarks"
  ],
  "options_ui": {
    "page": "optionsSBS.html"
  },
  "content_security_policy": {
    "extension_pages": "default-src 'self'"
  },
  "background": {
    "scripts": [
      "backgroundSBS.js",
      "commonSBS.js"
    ]
  }
}