This says something about HP's confidence in Firefox
"SVS [...] virtualizes individual applications, installing them in packages that remain separate from a machine's registry."
SVS seems to reinvent what user accounts already do on Windows. At least, what non-admin accounts already do on Windows, that is, isolate the app from the operating system itself. Even the Explorer shell and IE are isolated from the OS in this manner. Want new settings? Log on with a different non-admin account.
HP is telling me here that they don't trust Firefox to play nicely. Or they're assuming that their users are going to run Firefix (sic, heh heh) as admin. This might be a valid assumption, but it's still the wrong solution to it.