I have just recently gotten in the trend of using del.icio.us for my quick bookmarking needs.
I like to have my important bookmarks saved in my browser – and then for stuff I would want to come back later and read or check out, I use del.icio.us. Some folks out there would like to use del.icio.us instead of the default Firefox bookmarks system. For you there is del.icio.us Bookmarks.
This extension integrates your browser with del.icio.us (http://del.icio.us/), the leading social bookmarking service on the Web. It does this by replacing the default bookmarking functionality in Firefox with a new experience that offers the following advantages:
After installing this extension, your browser bookmarking functionality will change significantly.