Up to 10 percent of Google Chrome browser extensions may be up to no good. Of 48,332 Chrome extensions, 130 were found to be seriously malicious, and another 4,712 labeled suspicious, by six computer science experts at the University of Californias Berkeley, Santa Barbara and San Diego campuses. The researchers have also developed Hulk — not the gamma-irradiated superhero — which is a piece of software for detecting malicious behavior in Chrome browsers.