download https://addons.mozilla.org/en-US/firefox/addon/5045 what does it do? It doesn't matter if the tab(s) has(ve) been closed. Or in which tab the page was originally loaded. Thumbstrips will generate a thumbnail instantly and place it at the bottom of the page UPON the finish of the page loading. Doesn't matter if the new page is replacing an old page in current tab, or load a page in a brand new tab. Thumbstrips gives you a thumbnail history of your browsing session for your convenience.