removing these defaults. they are not used in 5.0. now we have mail.root.imap, mail.root.pop3, mail.root.none, mail.root.nntp. there is also a mail.newsrc_root. part of the work for #13305

modules/libpref/src/unix/unix.js

@@ -33,11 +33,8 @@ pref("browser.cache.memory_cache_size", 3000);
 pref("browser.cache.disk_cache_size", 5000);
 pref("browser.ncols", 0);
 pref("browser.installcmap", false);
-pref("mail.directory", "~/nsmail/");
-pref("mail.imap.root_dir", "~/ns_imap/");
 pref("mail.signature_file", "~/.signature");
 pref("mail.default_fcc", "~/nsmail/Sent");
-pref("news.directory", "~");
 pref("news.default_fcc", "~/nsmail/Sent");
 pref("mailnews.reply_on_top", 0);
 pref("mailnews.reply_with_extra_lines", 0);