5-9: Firefox allows you to display any Web site in a sidebar so you don't have to leave the Web site you're viewing. To open a bookmark in a sidebar, follow these steps: 1. Right-click the bookmark you want to open in a sidebar and choose Properties. The bookmark's Properties window appears. You can do this from the Bookmarks Sidebar, the Bookmarks Manager, or the Bookmarks Toolbar. If you're using Windows, you can also right-click the bookmark in the Bookmarks menu. 2. Select the Load This Bookmark in the Sidebar check box. 3. Click OK to close the Properties window. The next time you open the bookmark, it loads in the sidebar, as shown in Figure 5-9 (using Amazon Search as an example). This feature is especially useful if you put the bookmark on your Bookmarks Toolbar, as I describe earlier in this chapter, in the section "The Bookmarks Toolbar." You can close the sidebar by clicking the X in the top-right corner (of the sidebar, not of the Firefox window).   The slimmer, trimmer trend When you try opening sites in the sidebar, you might notice that as convenient as it is, many Web sites simply don't fit in such a small box. Firefox displays vertical and/or horizontal scrollbars to help alleviate this problem. However, this feature works best when you find Web sites that are designed to fit in small spaces. Many Web sites link to versions of their content that are specially designed for cell phones; these pages tend to work very well in the Firefox sidebar as well. Better still, many companies provide Web sites specifically tailored to fit inside browser sidebars and offer easy installation of these pages. For example, CNN offers a slender list of the latest headlines. Opera Browser's Web site (http://my.opera.com/community/customize/panel) includes a directory of sidebars. When you select a sidebar to install from the directory, Firefox automatically opens the Add Bookmark window. The bookmark that is added is just like any other bookmark, except it is configured to load in the sidebar by default     Opening bookmarks in new windows or tabs When you choose to open a bookmark, Firefox loads it in place of whichever Web site you're currently viewing. If you'd rather open a bookmark in addition to your current page, you can choose to open the bookmark in a new tab or a new window. This is as easy as right-clicking the bookmark and choosing Open in New Tab or Open in New Window from the menu that appears. You can right click on a bookmark in the Bookmarks Manager, the Bookmarks Toolbar or the Bookmarks Sidebar. If you're using Windows, you can also right-click a bookmark directly from the Bookmarks menu. Tip If your mouse has a middle button - or a scroll wheel that doubles as a button - simply middle-click any bookmark to open it in a new tab.