The CFCA CryptoKit.csgmall Extension is a custom-made Chrome extension developed by yszr0001 for use with the latest Chrome mechanisms. It is designed specifically for CFCA certificate application extensions and is intended for use within the South Grid Internet Service Co., Ltd.'s e-chain system.

By installing this extension, users are able to utilize CFCA U-key for multi-factor authentication, combining U-key certificates with user passwords, to meet the security requirements for submitting business data within the South Grid Internet Service Co., Ltd. Furthermore, this extension can be used for signing business contracts, ensuring the legality and traceability of contract attachments.