Show the issue, it works for me. see screenshot

Did you try Firefox in Safe Mode? https://support.mozilla.org/en-US/kb/diagnose-firefox-issues-using-troubleshoot-mode#w_how-to-start-firefox-in-4troubleshoot-modesf5safe-modesf

the issue, is the page either does not load, or i get a "this service is currently unavailable" on the usps site when i try to log into informed delivery. once i got a 504 error, but only once. i tried safemode, same thing. same with disabling my firefox ad ons.

What security software are you running?

none. all of my security issues were caused by viruses in ads. with ad block, i dont get that anymore, so i dont use any.

none. all of my security issues were caused by viruses in ads. with ad block, i dont get that anymore, so i dont use any.

This is confusing???

what is confusing? i dont get viruses since using ad block. the only thing confusing here is why usps doesnt work on my firefox, yet works on chrome and edge and on other's firefox. that is what i get when i try to log into informed delivery. made sure to include the address bar in it as well.

Thanks for the screenshot. https://informeddelivery.usps.com I was able to sign up for the service and I'm in my account. see screenshot

Try this option and make sure you know the login information. https://support.mozilla.org/en-US/kb/remove-websites-address-bar-suggestions

Also, can you try under a different windows account. If you don't have one, just make another account for testing.

if you look at the snip i posted, you can see my name at the top right. im signed in correctly. i can go to the usps site and then click on informed delivery and that still does not work. right now it wont even load up the page for informed delivery, either from a direct link from my home page, or from the usps site.

how would it be my windows account if i can use chrome and edge to use informed delivery?

Who are you using for DNS?

what does my dns have to do with usps not working on firefox?

Clear DNS

just did that, usps shows a loading circle and wont load informed delivery still.

I just signed out, cleared cache and history and now getting the same error. see screenshot After going to the home page, logging back in, it works again for me. Someone closer to Dev will have to chime in.

this is what i get when i try and log in sometimes.

A full browser screenshot would be more helpful that just showing what's in the browser window. Break out the Snip tool and get more useful screenshots.

Also, I'm curious to know your dns settings? Testing something different wouldn't hurt.