Outlook on web not working in Mozilla Firefox

Question

Outlook on web no longer works for me in Mozilla Firefox (v 147.0.4). When I load https://outlook.office.com/mail I just get the HTML text displayed. It works fine in Chrome. Anyone experiencing similar?

Answer 1

Hi Adrian Riley,

Thank you for reaching out to Microsoft Q&A forum.

I am very sorry for the inconvenience. If Outlook on the web is only showing “HTML code” in Firefox, it seems the page data or security/privacy settings are preventing the interface from loading properly. Please try the following steps in order:

• Clear the cache and cookies (site data) for outlook.office.com, then restart Firefox.
• Temporarily disable any ad blockers or privacy/security extensions (if any) for outlook.office.com.
• In Firefox, set Enhanced Tracking Protection to Standard (or add an exception for Outlook).
• Open Outlook on the web in a Private/Incognito window. If it works there, the cause is usually an add-on or a setting in your current Firefox profile.

If it still does not work, please try turning off Tracking Protection specifically for outlook.office.com and clear the site cookies one more time.

As a temporary workaround, you can continue using Chrome.

Please note that this is a user-to-user support forum. Moderators, contributors including external Microsoft employees cannot directly intervene in Microsoft product features or access back-end systems. Our role is limited to providing technical guidance on reported issues, requests, or ideas only.

Thank you for your understanding. 

---

If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".  

Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.