https://www.mozilla.org/security/announce/
http://www.extremetech.com/computing/178587-firefox-is-still...
> The two major advantages of this model are security and performance. Security would improve because the content processes could be sandboxed (although sandboxing the content processes is a separate project from Electrolysis).
Sandboxing Bug:
https://bugzilla.mozilla.org/show_bug.cgi?id=925570