It looks like NordVPN broke Firefox's ability to auto-update. A Reddit user tracked it down to NordVPN being the problem: "Figured it out. When NordVPN "Web Protection" is on, it fails to check for updates from the About menu as well. When "Web Protection" is off, it correctly checks for updates. I surmise that when Firefox fails to check, it assumes that I need an update and gives the original annoying message." The Web Protection is in the same area as NordVPN's "Threat Protection". It can be found by clicking the Shield icon on the left sidebar of the program. Please let us know if that gets rid of the failure to update messages in Firefox.