Firefox can't be opened after you install it on a Mac

Modified on Wed, 30 Jan 2019 at 11:09 AM

If you see the error message, "Firefox.app can't be opened because the identity of the developer cannot be confirmed" when you try to open it, here are a few things to try.


Try this first:

  1. Hold down the Control key while clicking on the Firefox icon in the Dock or on the Firefox application file in a Finder window.
  2. Click Open in the context menu.
  3. Click Open in the following dialog window.


If that doesn't resolve the issue, try this next:

  1. Click on the Apple icon at the top left corner of your screen and open System Preferences.
  2. Click on Security & Privacy, then select the General tab.
  3. You will see a message stating that the Firefox.app was blocked. Click on Open Anyway.

Was this article helpful?

That’s Great!

Thank you for your feedback

Sorry! We couldn't be helpful

Thank you for your feedback

Let us know how can we improve this article!

Select atleast one of the reasons
CAPTCHA verification is required.

Feedback sent

We appreciate your effort and will try to fix the article