I use FireFox all the time, except when I need to check a Web design in IE. The tabs are a big attraction because I tend to have lots of browser windows open, and the tabs let me group related open pages. For example, I have one FireFox window showing the HabitableZone in one tab, the ModSquad lounge in another, and other tabs as needed for things related to posting, such as Google searches and pages opened from the search results. Another FireFox window typically holds pages related to my current Web site project, typically the page I'm working on plus tabs open to various technical references. In general, when I start a task that involves Web browsing, I'll open a new FireFox window and then open pages in tabs as I work. Bottom line, the thing I like about tabs is that they let me organize the desktop by grouping related pages.