Hello. I have a Windows 7 HP Mini Netbook 32-bit. I just installed Firefox version 6.0.2 (the most updated one). Under Tools ---> Options ---> Tabs, "Warn me when closing multiple tabs" is checked. However, when I have multiple tabs open and I click on "X" (accidentally one time), it closed Firefox. No warning at all. I tested it again and again (checking the box, unchecking it, then checking it again), and it keeps closing all my tabs without warning. FYI...I also have a work laptop (Windows XP) and for some reason the "Confirm close" shows up when I try to close multiple tabs. Thank you.