Description from extension meta
PKI Based Digital Signatures using RSA Keys on Smart Cards/Tokens.
Image from store
Description from store
"Monachus Digital Signature Extension" and "Digital Signature Host Application", developed by Monachus.io, are all free digital sign products for developers/web users. Extension works on Chrome and Chromium base Edge browsers.
Basic extension functions:
Select Certificate : User views signing certificates in smart cards, USB tokens, PFX files on user's System or User's Local Certificate Store (Windows environment).
Sign Data / Sign Hash : Extension returns the calculated signature value by signing the data or hash values with the private key of the selected certificate.
To check working of this extension visit https://signature.monachus.io
Details and sample source code project is available at https://signature.monachus.io