Access Your IMAP Email Inbox Offline with Mozilla or Netscape

I try never to leave my home. I try never to leave my home without a book. But books that are thin and small and good aren't that easy to find. So I might just as well bring my notebook. Ah, I try never to leave my home.
If you have an IMAP account, then I'm sure you appreciate how you can access it from anywhere and always see the latest mails. But what if you'll be without net access? Here's how to take your emails with you in Mozilla or Netscape nevertheless.