I posted a message January 22 saying I couldn't figure out how to
remove the entry "Add to AOL Favorites" from my bookmarks, which was
installed after installing AOL Instant Messenger:

<64735112-79b6-4ae1-9bbe-c15e690ed81b@n20g2000hsh.googlegroups.com>

Turns out it was an add-on. I figured it out inadvertently today when
browsing my add-ons after installing one deliberately.