MicrosoftDeleted Thank you for that, worked like a charm! Unbelievable that it's such a simple difference that makes or breaks the page lol. I will find some way to automate this change for future launches of Firefox to make it work well until an official fix is in place (if ever).
Thanks again!
EDIT: What I did was I looked for the 19*.js script everywhere on the WAC host machine - found it in 3 places:
C:\Program Files\Windows Admin Center\UX.zip
C:\ProgramData\Server Management Experience\Ux
C:\All Users\Server Management Experience\Ux
The last one there just takes you to ProgramData, so really only 2 places; find the JS script, change ancestorOrigins to origin and save - unzip, change and rezip the one in Program Files.
Now, I am able to close and open Firefox many times and still access WAC remotely. I don't know how permanent this "fix" is - likely with the next module update it will be erased, but its at least one way to ensure persistence between Firefox sessions. Hope this helps someone!
