I'd say a lot, because to do the import you have to swamp your firefox bookmarks structure with your delicious one, and then import those using the toolbar. Of course this looses all of the tags, and comments, which are pretty much the whole point of delicious.

A system that actually gets all the data from delicious into google bookmarks seems to be worth while.

I hacked together something a long time ago to do this with a bookmarklet. It'll import delicious bookmarks into Google while preserving tags.

http://blog.lifeslip.com/articles/2006/10/25/bookmarklet-del...

That worked perfectly! I am hardly able to express how grateful I am :-)

It even worked more smoothly than the Google Toolbar's own importer, which complains about dupes (wrongly), and prefixes all the labels with "Tag:" for no good reason.

Will blog this ASAP.