Firefox is starting up on its own. I don't want it to because sometimes I don't need it, and when I go to shut down, computer won't let me because Firefox is running and I didn't know it. What to do?

I used to be in control of whether or not Firefox would load for any particular session on my computer. Now, probably after some update I got in the recent past, Firefox has a mind of its own. It opens every time I turn on my computer. There are times I don't want to use any browser, including Firefox. For example, sometimes I just want to look at my mail. Don't have time for anything else, but my computer won't let me shut it down. Why? Firefox sneaked in. So I have to find it and close it before I can shut down the computer.
HELP!!! How can I stop Firefox from automatically loading?
Thanks.

Welcome to Apple Support Communities
First, when you are going to turn off or restart your Mac, you will see a box called "Reopen windows when logging back in" in the shutdown or restart window. Untick this box and see if the App Store opens automatically in the next startup.
If it starts, open System Preferences > Users and Groups > Login Items, and see if the App Store shows up. If so, remove it from this list

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