microsoft[.]com/security/blog/2020/12/10/widespread-malware-campaign-seeks-to-silently-inject-ads-into-search-results-affects-multiple-browsers/
A persistent malware campaign has been actively distributing an evolved browser modifier malware at scale since at least May 2020. At its peak in August, the threat was observed on over 30,000 devices every day. The malware is designed to inject ads into search engine results pages. The threat affects multiple browsers—Microsoft Edge, Google Chrome, Yandex Browser, and Mozilla Firefox—exposing the attackers’ intent to reach as many Internet users as possible.
While the risk might not seem that great -- adding more ads that you'll hopefully ignore -- the malware sinks its roots fairly deep, and it's quite possible that the cyber-criminals behind it will pivot, capturing all sorts of info/data, further compromising your device.