I'm sorry, in order for us to assist you. You must elaborate on the issue you are having.

Thank you!

I mean - All of my email accounts are with MSN through Internet Explorer. Where do I log into them through Firefox?

You would log in the same way you did at the same place.

Did you import your IE Favorites into Firefox bookmarks? If so, and if you had a Favorite for your MSN mail site, you can use the bookmark. On the main toolbar, look for a pair of buttons that look like a star next to a clipboard. The one on the right drops down your bookmark list.

Or you can go to the MSN home page and follow the mail link there.