3 Ways to Fix Outlook if It’s Not Working In Firefox

Outlook is no longer compatible with some older browsers

by Claire Moraa
Claire Moraa
Claire Moraa
Claire likes to think she's got a knack for solving problems and improving the quality of life for those around her. Driven by the forces of rationality, curiosity,... read more
Fact checked by Alex Serban
Alex Serban
Alex Serban
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Outlook is a very popular email client that works on all major operating systems and browsers.

  • If you are using an older version of Firefox, then it may not be able to support all features of Outlook.
  • You can check if your antivirus software is blocking the site or disabling any add-ons from running on your computer.

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If you are using Firefox and Outlook, then it is possible that the browser may not be able to connect to Outlook. This is because Microsoft may have made some changes to Outlook, which makes it incompatible with older versions of Firefox.

Outlook works in a variety of ways — including through its own desktop application, via web browser-based access, and through mobile apps. Other times, Outlook won’t open but you can follow our tips and tricks to bypass this issue.

If you are having trouble getting Outlook to work in Firefox, you must find the cause of the problem and then attempt to resolve it using our recommended solutions.

Can you use Outlook on Firefox?

Yes, you can certainly use Outlook on Firefox. All you need to do is open the Outlook login page and sign in to your account. While it works on Firefox, sometimes you may encounter problems. So, Why is Outlook not opening in browser?

Here are some possible reasons:

  • Outdated browser – If you are using an outdated version of the browser, Outlook may not load on Firefox because of compatibility issues.
  • Third-party email client – If you’re using a third-party email client as an extension, it may interfere with Outlook and prevent it from loading.
  • Multiple tabs open – If you have multiple copies of Outlook open on your system simultaneously, one or more of them may be corrupting the process. You may also experience an issue where Outlook live is not working.

Which browser works best with Outlook? Outlook works with all modern web browsers including Google Chrome, Mozilla Firefox, and Microsoft Edge. However, if you want to take advantage of all the features available in Outlook then we recommend using Microsoft Edge.

It offers the best compatibility and performance with web-based services. In addition, both services are from Microsoft so you can expect the ultimate experience.

How do I get Outlook to open with Firefox? 

1. Update to the latest version of Firefox

  1. Launch your Firefox browser and click on the three horizontal ellipses in the top right corner.
  2. Select Help.
  3. Click on About Firefox.
  4. If your browser is up-to-date, you will get the following dialog box.

2. Restart Firefox/PC

This is an error that occurs when Microsoft Outlook fails to start up correctly and then tries to open. Restarting your browser can solve many problems that occur with email and other programs. 

If that doesn’t work, restart your computer. Press and hold the power button for at least ten seconds until the computer turns off. Then press it again to turn it back on.

3. Disable extensions

  1. Launch your Firefox browser and click on the three horizontal ellipses in the top right corner.
  2. Select Add-ons and themes.
  3. Click on Extensions then toggle off the Disable button until you find the culprit.

Sometimes you may try all these tips but Outlook is still not opening on Firefox In this case, you can try opening Firefox in safe mode or switch to Outlook-supported browsers.

If you have been successful but Outlook is slow, we have a guide on how you can fix it to solve the lag problem.

Let us know which solution worked for you in the comment section below.

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