Millions of Users' Privacy Exposed by Secret Browser Extension

A security researcher uncovered multiple browser extensions (Chrome, Edge, and Firefox) secretly collecting users' web activity data and sending it to a third party, MellowTel. These extensions access unknown websites, posing a significant threat to user privacy. The collected data included sensitive information like medical records, financial documents, and trade secrets. While some extensions have been taken down, many remain active. This incident echoes the 2019 Nacho Analytics case, highlighting the security risks of browser extensions.