Firefox professionals (i.e. Osman & co.), how do you set Firefox as your default browser?

Firefox professionals (i.e. Osman & co.), how do you set Firefox as your default browser?

Tools --> Options --> Advanced tab --> General tab
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*scratches head*
yeah how do i change it so when say i get an email and my msn shows i've recieved my mail... how do i set firefox as the web browser that i want to use?
because right now it always uses I.E...
http://support.mozilla.com/en-US/kb/How+to+make+Firefox+the+default+browser said:Note: MSN Messenger and other applications may be created to open Internet Explorer, no matter which browser is set as the default. Also, Internet service providers like PeoplePC Online, Juno and NetZero may provide connection software that automatically launches Internet Explorer.
Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature may not be available in some browsers.