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The original was posted on /r/browsers by /u/GreggAlan on 2023-09-13 03:40:09.
Things I have already done *which failed to fix it*.
Started in troubleshoot mode. Refreshed Firefox. Downloaded the newest offline installer and installed it. Tried renaming the profiles folders to see if would create new ones. Nope, it won't, not even when installing using the offline installer. Incognito mode.
Firefox steadfastly continues to insist it cannot find ups.com while other browsers can. A couple of months ago is was unable to find microsoft.com but works with that site now. I don't recall if I found a fix or if Firefox just suddenly decided one day to ack the existence of that domain.