After clicking on a bookmark it does not remain highlighted. it did this in 3.3 which made running through a list of bookmarks easier. I can make the highlight re-appear by clicking on the bookmarks box , not the x obviously!
In 3.3 if i clicked on a bookmark item, either to open in current tab or to open in new tab, the bookmark was highlighted with a blue bar. If I then backed out or closed the tab, the bookmark item would remain highlighted until I selected a new bookmark item. This made searching through bookmarks easy as I always knew the last item I had tried. In 3.6 the bookmark highlight disappears as soon as it is loaded, again either in current or new tab. However it can be made to re-appear by clicking on the little box above the bookmarks that contains the word 'bookmarks' and the 'x'