While it makes a great title, not ALL browser extensions are evil. In fact, most can be helpful. The problem is that each and every browser extension, no matter its intended function, has the capability to turn your digital world upside down. Given the amount of personal data users store and share on the web, web browsers have emerged as one of the largest and most vulnerable attack surfaces for cybercriminals. If a browser extension gets compromised or, even worse, is designed to be malicious from the start, your most sensitive data could fall into the wrong hands.