A newly found vulnerability (CVE-2016-9079) in the Firefox web browser was found to be leveraged in the wild. This zero-day was sold by Exodus Intel earlier this year and somehow got leaked. The FBI used a nearly identical one to expose some users running the Tor Browser in 2013. This latest attack continues to increase the concern over the effectiveness of the Tor Browers efficacy against exploits and how other browsers such as Google Chrome or Edge work to handle memory corruption and sandboxing.”]
Source: https://blog.malwarebytes.com/threat-analysis/2016/11/tor-browser-zero-day-strikes-again/