Rated 5 out of 5 stars

It's a pity that they will shut down. Alternative free solutions for cross browser synchronization if you are lost & confused like me in Delicious.com:

Use LastPass (https://lastpass.com/) for your passwords and SyncPlaces (https://addons.mozilla.org/de/firefox/addon/8426/) using your own web space / webserver for your bookmarks. SyncPlaces also synchronizes passwords - but only in FF.

This review is for a previous version of the add-on (3.9.2).