Description from extension meta
Use your electronic identification card for secure authentication and digital signing.
Image from store
Description from store
This extension allows using your smartcard or HSM right from your browser. Common operations includes: key generation, issuance of new certificates, signing & authorization, manipulation of certificates installed in user/system store.
The extension does nothing on its own, rather it makes the functionality available to a webpage that utilizes associated library to perform actions.
The user also has to have a native application that actually receives and processes said requests.