New
#11
Sorry, but I still don't think your advice fits the OP's best interests. All that's needed in this situation is to tell the OP that when Firefox is set to automatically install updates that it doesn't give any messages whatsoever that it's going to do so or requires user intervention. Firefox set to automatically update itself is set and forget it. The OP just needs informing that any update messages do not come from Firefox and can be safely ignored. Doing so will not cause an infection and will give the OP the latest security updates. All that's required here is to give the OP the knowledge that all these messages are bogus. No settings changes are required here.
Your advice might well be OK for a savvy user who wants to stall updates for feature or bug reasons, but it's not good advice for someone who doesn't feel confident in their abilities and wants to stay secure. That the OP is asking about these messages and their validity does tend to suggest that they just want assurances that the messages are bogus and can safely be ignored.