Tabs and bookmarks still feel pretty different. To update a tab, you activate the tab and then click links as usual. To update a bookmark, you activate the bookmark, click links, delete the old bookmark, create a new bookmark, and drag the new bookmark to the old one's location in the bookmark list (unless I've missed a shortcut here). Tabs feel very dynamic and are useful as a list or queue of work-in-progress, and bookmarks feel very static and are useful as a permanent list of important resources.
