1) make sure you have the latest version of Windows Live Messenger

2) Install Messenger Plus! Live (optional, as I have been told it is no longer required with the latest versions of Windows Live Messenger)

3) 2. Download StuffPlug and install.

4) Try clicking the email icon and see if your Hotmail inbox will be launched in Firefox. If not, then click StuffPlug 3 from menu and select Options. Go to General tab and make sure the option “Open all URLs in default browser” is checked.

All should be working with FireFox