Get Firefox 3.5 to Use Google Apps Mail for Mailto: Links

4 Sep ’09 — 5 Comments

Have a Google Apps account that you want to use as your default mail client in the Firefox web browser? Here are the instructions:

  1. In the Firefox address bar, type about:config and press Enter. Click to indicate that you want to proceed.
  2. In the filter box, type gecko. to show fewer config items.
  3. Look for an item called gecko.handlerService.AllowRegisterFromDifferentHost and double-click on it to change the value from false to true.
  4. Copy the following code into the address bar and press Enter:
    "","Google Apps Mail")

    NOTE: change to the actual text of your domain (mine is, so I put that there, even with the period).
  5. On the prompt asking whether or not you want to add the mailto handler, click OK.
  6. Open up Firefox’s Options (Tools >> Options on a PC or Firefox >> Preferences on a Mac). Go to the Applications tab.
  7. Scroll down until you see a Content Type of mailto, and change its action to Google Apps Mail.

Once you’ve followed those steps, clicking on an email link (with the prefix mailto:) will create a new email in your Google Apps Mail account!

5 responses to Get Firefox 3.5 to Use Google Apps Mail for Mailto: Links

  1. David Hays Buckley 4 Oct ’09 at 10:41 pm


    I think I commented on this in the iPhone post–sorry!

    Be well,


  2. David Hays Buckley 4 Oct ’09 at 10:42 pm

    My misposted “comment” (query):


    Many thanks for post re teach FF 5.3 (on Mac, 10.5.8) use Google apps for mail. Bummer is followed exactly, got choice of Google Apps in FF prefs but every time I click a mailto link (couldn’t find one for you) it tries to open Gmail, not Apps. Any advice?

    Very beautiful kid, btw. Enjoy each other for a long time.

    Be well,


  3. When you go through step seven, do you see “Use Google Apps Mail” as an option for mailto in FIrefox’s preferences? Or do you just have one (or two) options in the drop-down for “Use Gmail”?

    If that doesn’t help, you can start over. To delete the mailto option that you created, go into Firefox’s preferences, to Applications, and then click on mailto. Select the last option in the list, for”Application Details”. You can use the window that appears to remove the mailto link that you previously added, and then start over from the 4th step, above.

    Be sure to pay special attention to the text in step four – you MUST change this text to get it to work for you.

  4. Can this procedure be automated?

  5. I noticed a problem with this. I also had regular Gmail loading using the above exact steps. To get my google apps account loading, I had to edit the URL to remove the /mail/.. You have it as etc..

    Whereas it should only be etc.

    Hope this helps,


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