i browse an online shop. i want to browse two or more different categories on different tabs. for instanse, i find a product and go to detail page in pc hardware category. then i find another product in pc software category. After these steps, i come back to the tab include the product in pc hardware category and use back button. Then this tab show me the pc software category... So if the same website browse with multi tabs. the last action is the definition for all briwsing tabs. you can try any tab, all of these are go same page that the browser's last used page. firefox 4 - win xp/win vista/win 7 i try all these os, and the problem is same