I am also using the nvidia driver and viewing a signed code of conduct page causes X to restart immediately. I experience the same behavior in both Firefox and Epiphany (seems to be generally related to gecko). I do not have the same problem when I visit the page using Opera.
0000:01:00.0 VGA compatible controller: nVidia Corporation NV37GL [Quadro FX 330] (rev a2) -- Clicking on Codes of Conduct link in Launchpad crashes X https://launchpad.net/bugs/49789 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs