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Outlook.com email not working when using Firefox browser Since you can access your Outlook account using another web browser, we can validate that the issue has something to do with the Firefox browser. This could be due to a browser update that is recently applied to your Firefox. In this case, we suggest that you contact Mozilla Support team to assist you with fixing your browser. Firefox Extensions Stopped Working This Morning but a Fix May 04, 2019 Why is Yahoo not working with my Mozilla Firefox Browser

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