https://arstechnica.com/information-technology/2020/10/popular-chromium-ad-blockers-caught-stealing-user-data-and-accessing-accounts/

Adblocking extensions with more than 300,000 active users have been surreptitiously uploading user browsing data and tampering with users’ social media accounts thanks to malware its new owner introduced a few weeks ago, according to technical analyses and posts on Github.