You’ve installed this new flashy browser. Everything makes more sense. The real-estate is put to better use, it simplified and it’s faster. But, and it’s a big but, your beloved del.icio.us add-on no longer works. Yahoo have some explaining to do. For a tech company of their size it’s hardly acceptable to be so slow in releasing updated versions of your software.
That aside though, after digging around in the support forums, I this the following link. A user on the del.icio.us support forums built this installation file which is compatible with FF4. Nice one!
Here you can see my del.icio.us bookmarks working in FF4, thanks to the above XPI :