Change the program used to open email links

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Firefox normally uses your operating system's default mail program to send an e-mail message. This article explains how you can change the program that is launched when you click on:

Setting the mail client used by Firefox

  1. Click the menu button New Fx Menu Fx57Menu and choose Options.Preferences.
  2. Select the Applications panel.In the General panel, go to the Applications section.
  3. Search for the Content Type mailto and select it.
  4. Click on the Action column in the mailto row to change the action.
    Fx54Applications-mailto Fx56GeneralApplications-mailto Fx56GeneralApplications-mailto_Linux mailto 57
    • Always ask will prompt you each time you use a mail function for which program or service to use.
    • Use <Program> (default) will automatically launch your operating system's email program (for example, Thunderbird, Outlook, Windows Live Mail Windows Mail Mail Evolution, KMail) to its message composition window. For instructions on how to change your operating system's default e-mail program, see the next section of this article.
    • Use <Webmail> will open your webmail service's (e.g., Yahoo! Mail, Gmail) message composition page inside Firefox. For more information about using webmail services, see the Using webmail services section of this article.
    • Use other... will let you specify an external program for Firefox to launch.
    • Application Details... will let you view information about or remove the webmail services that Firefox can use.
  5. Close the about:preferences page. Any changes you've made will automatically be saved.

Setting your operating system's default mail program

By default, Firefox will use your system's default mail client to send email for the actions listed above. For Thunderbird, see the Make Thunderbird the Default Mail Client article for steps you can take to make it the default mail program. Check the online or in-product documentation for other mail programs.

In general, you can change the default mail program by following these instructions:

  1. Click the Windows Start button, then click the Default Programs item.
  2. Click on Set your default programs.
  3. Under Programs, click the email program you'd like to use (e.g., Thunderbird, Windows Live Mail, Outlook).
  4. Click Set this program as default.
  5. Click OK at the bottom of the window.
  1. Click the Windows Start button, then click on the Control Panel icon to open the Windows Control Panel.
  2. Click the Add or Remove Programs icon to open the Add or Remove Programs applet.
  3. On the left side of the Window click the Set Program Access and Defaults icon.
  4. In the Access and Defaults window, click on the Custom radio button to expand the Custom category.
  5. Underneath Choose a default e-mail program, click the radio button next to the program you want to use (e.g., Thunderbird, Windows Live Mail, Outlook).
  6. Click OK at the bottom of the window.
  1. Open the Mail application from the Applications folder.
  2. Click on the Mail menu and select Preferences.
  3. Click General button.
  4. Select a new default mail program (e.g., Thunderbird, Outlook).
Note: These instructions are for some common Linux distributions. Your distribution may use a different interface.


Distributions that use the Gnome Desktop Environment by default include Ubuntu, openSUSE, Fedora, Red Hat Enterprise Linux, and more.

  1. Open the Preferred Applications window. The Preferred Applications window can be opened by:
    • (Ubuntu) Clicking on the System menu, selecting Preferences, and then selecting Preferred Applications.
    • Clicking on the Applications menu, selecting Desktop Preferences, then selecting Advanced, and then selecting Preferred Applications.
  2. Underneath Mail Reader, use the dropdown menu to select a mail application (e.g. Thunderbird, Evolution).
  3. Click Close to close the Preferred Applications window.


Distributions that use the K Desktop Environment by default include Kubuntu, Mandriva Linux, PCLinuxOS, and more.

  1. Open the KDE Control Center by clicking on K and selecting Control Center.
  2. In the Control Center window, click to expand KDE Components.
  3. Click to select Component Chooser.
  4. Click to select Email Client.
  5. Click to select the Use a different email client radio button.
  6. Type the full path to your e-mail client (e.g. /usr/bin/thunderbird).
  7. Click Apply to close the Control Center window and save your changes.

Using webmail services

Firefox allows webmail services (such as Gmail, Yahoo! Mail, etc.) to enable you to use them for Firefox's mail functions. Use the instructions in the Setting the mail client used by Firefox section above to use a webmail service with this method.

If the webmail service you want to use is not available in the Firefox OptionsPreferences Applications panel as a mailto choice, you may be able to find an extension for your webmail provider.

Based on information from Default mail client (mozillaZine KB), How to change the default web browser or email application ( Support), The KDE Control Center (, and Select Preferred Applications in Ubuntu (