How do I change my Mac Security Settings so I can open Firefox Marketplace apps?

This article is no longer maintained, so its content might be out of date.

Marketplace apps no longer run on computers with Firefox as of Firefox 48 for Windows, Mac OS X, and Linux. For more information about the change, see Firefox Marketplace Apps Stop Working on Firefox 48+ for Windows, Mac, and Linux.

If you’re using Mac OS X 10.9.5 (or higher), your Mac’s settings may allow you to open only apps installed from the Mac App Store. This article walks you through on how to adjust your Mac’s settings so you can install and open Firefox Marketplace apps. To learn how your Mac's security settings affect the apps you download, please visit Apple Support.

Install the app

  1. When you find an app that you would like to install, click the blue button. If the app is free, the button will say that. If the app costs money, the price will be listed on the button.
    marketplace desktop
  2. Confirm that you want to install the app by tapping the Install button on the prompt.
    confirm install
  3. Your app will download and appear in your Mac's Applications folder.
    applications mac

Open the app

Double-click the app's icon in your Applications folder. If the app opens right away, start using it!

If you see the following security message, it means your Mac's settings allow you to open only apps downloaded from the Mac App Store. Let's fix that:

  1. Click OK to close the message.
    close error mac
  2. Now open your Mac's System Preferences (by clicking on the Apple logo on the top left corner of your screen) and click the Security & Privacy icon.
    security mac
  3. If your settings are locked, click on the lock lock mac on the bottom left corner of the window and enter the admin password.
  4. Click the Open Anyway button in the General tab. This tells your Mac that it's okay to open the Firefox Marketplace app you just downloaded.
    Note: You'll need to do this once for each app that you download.
    open app mac
  5. Click Open to confirm that you want to open the app. Now start using your app!
    open app confirm mac

Learn more about Firefox Marketplace

// These fine people helped write this article:Michele Rodaro, dskmori, mykmelez, Joni, StoneKany, Artist. You can help too - find out how.
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