I have a 3 monitor setup - 3 x Dell 2410. Windows XP, and goes through a TripleHead2Go digital box. Vid card is nVidia GeForce 8800 GTS. Up until FF 4, no problems. Since 4, and now into 5, have had problems with windows. I hate tabs, so I open new windows. I do NOT want "just use tabs". I HATE THEM. They decrease my window size. I do NOT use them. I WILL NOT. I have my windows in the center monitor. When I maximized, it maximized in this center monitor (which is an artificial construct, due to the TH2Go adapter) - not 3 monitors wide. When I opened a new window, if maximized, it opened in the same middle monitor. If I used "restore down", the window would be the same size, but moved over to the right a distance of the size of the FireFox icon on the absolute upper left of the blue bar on top. Since Firefox 4, many web sites have messed with the new window setting. Most common is a new window opening maximized in a window the same size, but on the leftmost panel. When I used restore down, the window goes to a very small window at the upper left, which I can move, and I do, to the middle, and resize the size I want (monitor sized), and then maximize, which restores it the way I want. Another is a window opening in the entire size of the screen (3 monitors wide), but in the "restore down" setting, and not maximized. I can drag the lower right corner to the left to resize this to one monitor wide, move the whole window to the middle, then hit maximize. This is frustrating, but only mildly, and I take it as a consequence of using FF. However, this evening, a new thing happened. When I maximized, the FF window went to the entire size of my screen (3 24" widescreen monitors wide). When I restored down, it went to the way of FF3 and before - the window in the middle, then successive windows offset to the Right, offset a distance equal to the FireFox logo in the upper left. All I want is the first window to open maximized in the middle panel, and other opened windows to open maximized overlying the prior ones in the same space, not offset to the right. I have searched and searched, and not found an answer, and do not know where are the sizing options in the settings of FF. I did try safe mode and restore original settings, and it did not change anything. I did not install any updates before this happened. After FF5 gave me the option to upgrade, I did, and the browser worked as it had before, without changing. Thank you for any help!