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Re:All Major Browsers Fall at Pwn2Own Day Two by anonymfus on Friday March 20, 2015 @04:32PM (#9240503)
And nesting of virtual machines is still useless if you have bugs in CPU like this (2012):

http://www.kb.cert.org/vuls/id/649219

Re:All Major Browsers Fall at Pwn2Own Day Two by oblio on Friday March 20, 2015 @05:00PM (#9240667)
And then you add a hardware emulator!
Re:All Major Browsers Fall at Pwn2Own Day Two by wtallis on Friday March 20, 2015 @08:45PM (#9241467)
That only applied to Xen's paravirtualization mode (runnning a modified guest OS as an unprivileged process), not the hardware-assisted virtualization.