Setting up Firefox to use Gmail for mailto links

Go to the following menus in Firefox:

Edit->Preferences->Applications

Look for the "mailto" Content Type and click the drop-down. You should now see "Use Gmail" as an option. Select it and click Close.

Now when you click on any mailto link it will send the email in GMail.

NOTE: if you are running an older version of Firefox you many need to manually register GMail as a mailto option. The following explains how to do that.

First login to your Gmail account in a tab.

In that same tab past the following code into the URL bar an press enter:

javascript:window.navigator.registerProtocolHandler("mailto","https://mail.google.com/mail/?extsrc=mailto&url=%s","GMail")

If you are using Google Apps then page the code below instead:

javascript:window.navigator.registerProtocolHandler("mailto","https://mail.google.com/a/example.com/mail/?extsrc=mailto&url=%s","GMail")