Social bookmarking service Del.icio.us has updated the the add-on for Firefox 3 and it has got a few new features -

• Jump to Tag feature (press F2) allows you to quickly access tags and
  bookmarks using the keyboard
• New layout for saving bookmarks
• Preferences now in a separate dialog under Tools (which also can be
  invoked via the prefs button on the FF Add-ons pane)
• Status bar indicators for network activity, new links for you, and the del.icio.us website
• Classic mode for users who just want simple buttons without the overhead of sync

It is also Firefox 2 compatible with Firefox 2. This is in beta state and fettures may change and no support yet.

Read about it here

Get the add-on here