Firefox Delicious add-on
So, I am trying to figure out how to sync up my Firefox bookmarks with Delicious, simply and solely (I confess) so I can more easily access my fanfic bookmarks from my Blackberry and read it on the sly. However, I can't seem to find an add-on that will do what I need, namely

(1) import my many many FF bookmarks to Delicious and automatically tag them with the titles of the folders in which I have so painstakingly organized them (I thought this was a no-brainer, but not a single one actually claims to do this);

and (2) allow me to sync only manually, so that I can run FF on my computer without having to wait forever because it's running slower than molasses due to the cross-talk with Delicious.

(I would also love (3) the ability to make my Delicious bookmarks default to private rather than public, but I understand this is something that has been bitched about for a long time without any result.)

Please help! Even if your suggestion meets only one of these criteria, it would be of great use to me!

ETA: So now I hear there are other sites besides Delicious for bookmarks that are web-accessible from any computer/smartphone. Any recs or pros/cons regarding these? I'm currently rather fascinated by Diigo; what is everyone else using?