Popups Are Blocked in the menu that appears. The bar closes immediately and doesn't appear the next time a popup is blocked, but you will still be notified by the icon in the bottom-right corner of the window (refer to Figure 9-1). If you later decide you want the bar back, click the icon and deselect the Don't Show Info Message When Popups Are Blocked option, as illustrated in Figure 9-2. Figure 9-2: If you hide the popup blocked notification bar, you can turn it back on later by using the Status Bar icon.           Viewing Blocked Popup Windows Although most popup windows are used to display advertising, some contain login forms or other legitimate contents that are necessary parts of a Web site. Because Firefox cannot tell advertisements apart from other content, it blocks all popup windows indiscriminately. However, you can open them manually, as I discuss in the following section. So how can you tell which popups are legitimate without having to open all of them? A good rule is that if you're trying to do something that isn't working at the same time a popup is blocked (as indicated by the notification bar and icon shown earlier in Figure 9-1), you probably need to use the popup window to continue. For example, if you click a Web site's Log In button and nothing appears to happen, the Web site probably tried to open a popup login window that Firefox blocked. Tip The directions in the following two sections assume that you have not disabled Firefox's popup blocking notification bar by choosing the Don't Show This Message When Popups Are Blocked option, as I describe in the preceding section. If you have disabled the bar, you can still do everything I outline here, but instead of clicking the Options button on the bar, you must click the popup icon at the bottom of the window (as shown earlier in Figure 9-2).   Opening blocked popup windows Firefox allows you to specify that certain Web sites can always open popup windows. This feature comes in handy if you decide that a Web site opens only legitimate popups. In some cases, however, you might want to peek at a blocked popup window to confirm its legitimacy before making such a permanent decision. You might also want to do this if you don't intend to revisit the Web site later and you need just one-time access to the popup. To accommodate these cases, Firefox lets you open a blocked popup window without changing any long-term behavior. In other words, even after you decide to view a popup, all future popup windows from the Web site that opened it will continue to be blocked. 1. Visit the Web site that tries to open the popup window you want to view. 2. When Firefox blocks the popup, click the Options button at the right end of the notification bar. 3. Choose the last option, which begins with the word Show and contains the Web address of the popup window that Firefox blocked. If the Web site tried to open multiple popup windows, Firefox displays an entry in the menu for each one, as shown in Figure 9-3. Unfortunately, the only distinguishing factor between each menu item is the addresses that the Web site tried to load into each of the blocked windows. For example, in Figure 9-3, Firefox blocked three popups, and although each Show menu item appears