TL;DR: This extension for Chrome and Brave is malicious, do not use it.
(Update) A follow up story by Wladimir Palant: https://palant.info/2024/10/30/the-karma-connection-in-chrome-web-store/
(Update 2024-11-11) The extension has been removed from CWS and marked as violating Chrome Web Store policies (which is good, but odd, as it should be marked as malware)