I think that tab isn’t copilot but windows’ acct‑broker firing when an old m365 token dies…just remove that stale work acct once in settings→accounts→access work or school. If it still loops, set web account manager (tokenbroker) to manual in services.msc, that’s the last place it hides.
How do I stop Microsoft Copilot hijacking my browser?
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Brad Judd
5
Reputation points
A tab has been spontaneously opening to "microsoft365.com/auth=2" in my browser. It happens for no discernible reason, whether or not I am using MS365 programs, occasionally when I am not even at my computer.
I am on an HP laptop running Windows 10 Home, my browser is Firefox (137.0.1 64-bit). I have checked for add-ons and registry edits that could have caused this problem. When I have searched online, I can only find results about issues with documents opening in browser.
I have absolutely no interest in using this "feature" and am alarmed at this hijacking behavior. Short of completely uninstalling MS365, how do I stop this from happening?
Microsoft Copilot | Other
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Crystal O 0 Reputation points2026-03-26T15:17:53.88+00:00 same thing here, my work account that is ONLY in outlook and copilot apps have been uninstalled via add remove and disabled in every ms365 app deliberately, and use FF as default browser (desktop win 11 25h2 pc) with it's AI disabled... i walk away from pc and come back to https://m365.cloud.microsoft/search/?from=OfficeKey this page open in my browser showing a search and the documents from my work onedrive (which is NOT signed in on my pc at all anywhere)... it's Incredibly Annoying! help me remove this intrusive AI copilot random search page showing up the last few days
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