Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Why will Outlook Mail no longer work in your browser after upgrading my Mac to OS X 10.10.5?

more options

I upgraded my Mac OS X to 10.10.5. I can no longer launch my Outlook Mail browser in Firefox. It works in Safari, but I mainly use Firefox.

I upgraded my Mac OS X to 10.10.5. I can no longer launch my Outlook Mail browser in Firefox. It works in Safari, but I mainly use Firefox.

All Replies (1)

more options

Many site issues can be caused by corrupt cookies or cache. In order to try to fix these problems, the first step is to clear both cookies and the cache. Note: This will temporarily log you out of all sites you're logged in to. To clear cache and cookies do the following:

  1. Click the menu button New Fx Menu, choose History, and then "Clear Recent History...".
  2. Under "Time range to clear", select "Everything".
  3. Now, click the arrow next to Details to toggle the Details list active.
  4. From the details list, check Cache and Cookies and uncheck everything else.
  5. Now click the "Clear Now" button.

Further information can be found in the Delete browsing, search and download history on Firefox article.

Did this fix your problem?