What is a malicious virus in the browser?

Question

JavaScript

And such a parasite appeared in the browser inspector, tell me where to look.
Something strange, on almost every site.

Answer 1

In 90 percent of cases, viruses hide in malicious extensions, if you are sure that it is a virus. In other cases, it is a virus on the PC itself, which injects its code into the browser process. I don't think it's that hard