What a RPITA this has been. Hopefully I'll save someone else some time.
I'm using FF to access Watch ESPN, which had LOCKED ITSELF into my former cable/sat/subscription provider. No matter what I deleted/cleaned/reinstalled/ etc. it wouldn't let go. No help on espn's site either. Their 'chat-bot' went TILT/Tango Uniform for about 10min. before responding "recycle your modem".
ESPN's customer service number is well hidden on their site. Calling it resulted in the worst quality message I'd ever heard...since an old ATT one.
I began searching through FF history looking for a old link and found this:https://identity1.dishnetwork.com/saml/module.php/authbypass/lastbookend.php? AuthState=_xxxxxxxxxxxxxx.dishnetwork.com%2Fsaml%2Fsaml2%2Fidp%2FSSOService.php%3Fspentityid%3Dhttps%253A%252F%252Fsaml.sp.auth.adobe.com%
It's trying to reach Dish through sp.auth.adobe.com?
Adbe FP was out-of-date, so I updated, cleared, reset and....no joy.
I even dwnld'd Opera to start with a new browser other than FF. It wouldn't work with it either!! More confounding was I'd made the switch on a LT running FF!
Meanwhile NCAA football is going by I'd like to watch.....
The solution turned out to be that I'd not allowed any 3rd party cookies in FF. When I changed this switch to 'allow', closed, opened FF again, back to espn, chose the new provider, I was 're-directed' where I could log in, then was transferred back to espn.
What a PITA......