Since a update of firefox I can't sign in to my xbox games,why

I would recommend you to go to Firefox download page and update to the latest version. If it's already updated, you would see an option to "Refresh Firefox". Refresh your browser. Hope this would work. Let me know. Make sure that you are logged in to your Mozilla account. Try the link below. https://www.mozilla.org/en-US/firefox/new/

Tried that first, no help.

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