I'm running Firefox 42.0; I successfully installed the patch from Live Update this morning, and am now running Norton 22.5.5.14.
The Norton Toolbar is unchanged in Firefox-- it's still what I call a "stub" with no Identity Safe/Vault access at all. I restarted FF, then rebooted my computer (restarted). I also ran Live Update a few more times just to make sure I wasn't missing an update.
To those who get uptight about spoiling "their" months-old thread with "off topic" posts: the "vault issue" is still a problem for me, it's just compounded by the larger problem of Identity Safe functions not being compatible with Firefox.
If this supposed "fix" doesn't apply to Firefox, Mohan G. should've said so in the announcement. Stop trying my patience, then thanking me for not losing it altogether.