Extensions for the internets most popular platforms may contain malicious software and should be uninstalled. At least 28 browser extensions were analyzed by Avast Threat Intelligence researchers after the threat was identified by Czech researchers at CZ.NIC. The extensions contain malicious code that makes it possible to download even more malware to a person’s computer. They also manipulate all links that the victims click on after downloading the extensions. They can be used to collect personal information about the user, including birth date, email addresses, device information.”]
Source: https://blog.avast.com/malicious-browser-extensions-avast