Outlook Online is not rendering properly

David Milkes 25 Reputation points
2025-11-05T18:54:14.26+00:00

Since about 12pm EST today, the page outlook.office.com/mail is displaying the HTML code instead of the GUI when using Firefox. However, it's fine in Chrome. This was not a problem until today.

Do you know how I can solve this problem in Firefox?

Outlook | Web | Outlook.com | Email
Answer accepted by question author
Edward Schlobohm01 10,210 Reputation points Independent Advisor
2025-11-05T19:55:59.4133333+00:00

Hi,

Thanks for reaching out. There’s a known issue with Outlook Online in Firefox that started around noon EST on November 5, 2025. When visiting outlook.office.com/mail, the page shows raw HTML instead of the normal interface, though it works fine in Chrome.

Microsoft hasn’t confirmed the cause yet, but it’s likely a browser rendering bug or a server-side configuration issue.

In the meantime, try clearing Firefox’s cache and cookies, disabling extensions, or using Private Mode. You can also switch to Chrome or Edge temporarily and make sure Firefox is up to date. If the problem persists, report it to Microsoft through their support channels.

Please visit this article for more information- https://support.microsoft.com/en-us/office/fixes-or-workarounds-for-recent-issues-in-classic-outlook-for-windows-ecf61305-f84f-4e13-bb73-95a214ac1230

Hope this helps,

Regards,

Edward

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