"When opening a bookmark in Firefox, the bookmarked web page will open on the active tab by default. The behavior can potentially cause a user to accidentally lose the web page he or she is browsing or close the tab with unsaved work to load the new website. Since Firefox supports tabbed browsing, it would be great if the bookmarked links can be opened and launched in a new tab instead". Read more: http://www.mydigitallife.info/2008/07/24/workaround-to-open-bookmarks-in-new-tab-in-firefox/