Google has removed more than seventy so-called extensions for the Chrome browser. The utilities were used to spy on people.
All told, they had been downloaded 32 million times.
Cybersecurity Awake Security discovered the malicious extensions. Users thought they installed a program to warn about malicious sites or to convert files.
In reality, the programs tracked which sites someone visited. The makers were also able to access internal systems of companies.
It is not known who is behind the espionage. Such data can be of interest to state spies, but also to criminals.