Firefox → Bookmarks menu → Manage Bookmarks → New Bookmark →

→ Bookmarks Toolbar Folder
That will create a bookmark that loads your del.icio.us inbox (or del.icio.us/popular if you prefer) in the sidebar, for easy browsing.
@-moz-document url-prefix(http://del.icio.us/inbox){
.right { display: none !important; }
}
will hide the subscriptions list.
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