My daughters setup has been fine for over a year using Office365 for her classes. Today she reported she cannot open any of the files. Behavior is we can sign in fine, see all the files listed, looks good. However we click a file, and the title up top says "Working..." and the history tab will flood with about 10 attempts on a sharepoint site, then give a sign in error asking to sign in again. This will fail each time. I tried basic steps, cleared cookies, no dice. Only ublock was in use, without issue previously, but disabled and removed and it still did it. I even loaded up a new blank profile, nothing added, same behavior. I tried on my PC's firefox and it does work correctly. Both are v 110.0.1. Any suggestions to what I've tried? I would expect no extensions and new profile would resolve it. For now it works via chrome , but we're a firefox family.