If you open a bookmark, it will always use the current tab. However, I have bookmarked several pages in different ebooks about a specific topic and I would like to have them simultaneously opened, each PDF in its own tab. Now I have to open any other PDF, focus this tab and then to doubleclick the bookmark. Also there could be an option "open in a new tab" in the contextmenu of the bookmark to allow opening it in a new tab even if the same PDF is currently opened and its tab focused. Thanks! :-)