Strange ZAP alert post-Firefox install.

I recently installed Firefox and am now getting a fairly strange ZAP alert every few minutes. I don't recall the exact message, but is says that lsass.exe is trying to modify ZAP's processes. I did have a cable modem overheat on me a few mnutes ago and had to swap it out, but that didn't seem to affect anything other than to have ZAP throw a fit redetecting the network. Virus scan is clean; Spybot is the same aside from the usual minor annoyances.

Is this legit? I just find it strange because I've never gotten that alert before.