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Google security researcher Tavis Ormandy recently discovered a serious vulnerability in the Chrome extension that leaves PCs wide open to attack .
 ( discover vulnerability: discovered,  Google security researcher Tavis Ormandy: discoverer, a serious vulnerability: vulnerability, the Chrome extension: vulnerable system, leaves PCs wide open to attack: capabilities) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: phishing, data breach, ransom, discover vulnerability, patch vulnerability, Arguments type: vulnerable system, capabilities, vulnerability, number of victim, issues addressed, compromised data, damage amount, common vulnerabilities and exposures, victim, patch number, number of data, tool, discoverer, time, purpose, place, payment method, releaser, vulnerable system version, attacker, supported platform, patch, price, vulnerable system owner, trusted entity, attack pattern. 
Text: {0} 
Answer:
 ( discover vulnerability: discovered,  Google security researcher Tavis Ormandy: discoverer, a serious vulnerability: vulnerability, the Chrome extension: vulnerable system, leaves PCs wide open to attack: capabilities) 