Firefox extension to open mailto in Hotmail?

"You can follow this short tutorial:


Type about:config into your location bar and hit enter. If you've
never edited used about:config before,
you'll see a warning.
Click I'll be careful, I promise! This will bring you to the
about:config window.
In the filter field type gecko. Double click the first entry
gecko.handlerService.allowRegisterFromDifferentHost
to change the value to true.
Copy and paste the text between the following text into the location bar
and hit enter:
javascript:navigator.registerProtocolHandler('mailto','http://hotmail.msn.com/secure/start?action=compose&to=%s','Hotmail');
You will see an information bar drop down at the top of the window.
Click Add Application. You've
finished installing the Hotmail
protocol now you just need to select
it.
Go to Firefox>Preferences>Applications, if
you are using a Mac, or
Tools>Options>Applications, if you are
using Windows. Now scroll down the
list by content type and find mailto.
In the drop-down menu to the right
select Use Hotmail.
Next, return to about:config.
If the warning comes up again, click I'll be careful, I promise!
In the filter field type gecko, and double click the first entry
gecko.handlerService.allowRegisterFromDifferentHost
to change the value back to false."