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:
   javascript:window.navigator.registerProtocolHandler("mailto",
"https://mail.google.com/mail/a/yourdomain.com?extsrc=mailto&url=%s","Google Apps Mail")
   NOTE: change yourdomain.com to the actual text of your domain (mine is schellack.net, 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!