http://kb.mozillazine.org/Windows_Media_Player
https://addons.mozilla.org/firefox/220/
Next One Is One Of My Favs:
https://addons.mozilla.org/firefox/201/
For Bookmarks:
https://addons.mozilla.org/firefox/2469/
https://addons.mozilla.org/firefox/1508/
And IF you are worried about you rcontent being on bit torrent or just seeing what "apps" are out there -
https://addons.mozilla.org/firefox/2607/
Bookmarks