Not sure where to report this - feel free to move as necessary. I made a reservation that includes a few UA segments, and subsequently added it to my account on united.com.

Now, when I log into my account using Firefox - there is nothing under "change or view existing reservations"
When I log in using Safari (from the same computer, mind you) - the reservation is listed under "existing reservations"

I re-added it in Firefox twice. Re-adding seems to be broken as well - I am asked for account and password on the next screen, as if not logged in, then reservation seems to get added and stick around until the end of Firefox session. Then it's gone again - but only in Firefox. It's visible in Safari all the time.

How the heck is that even possible? (I might try to fake browser agent and see what happens)