is called browsing history, and by default, Firefox stores records of all the Web sites you visited in the past nine days. To configure or clear browsing history, follow the directions in the preceding section, "Working One-on-One with Your Data," to get to the History tab of the Options window. From there, you can do any of the following: Shorten or expand how many days' worth of Web sites Firefox remembers in browsing history by replacing 9 with a new number. Instruct Firefox not to remember browsing history anymore by replacing 9 with 0. Firefox won't track any Web sites you visit in the future, but your current browsing history remains until you clear it. Clear your current browsing history by clicking the Clear Browsing History Now button. Firefox clears the history as soon as you click the button and the action is irreversible. Note that this doesn't turn off browsing history; it only clears your current history. New history accumulates when you resume surfing. If the Clear Browsing History button is unavailable, your browsing history is already empty. More information about browsing history is available in Chapter 6. Getting rid of old saved forms As I discuss in Chapter 8, Firefox remembers information you enter into Web sites so you don't need to keep reentering it. For example, it can remember your username at a site you log in to frequently, or your ZIP code at a weather site. Firefox also remembers phrases you enter into the Firefox Search Box so you can use them again more quickly. Collectively, this is called saved form information, and by default, Firefox remembers it indefinitely. To configure or clear saved form information, follow the directions in the section "Working One-on-One with Your Data," earlier in this chapter, to get to the Saved Forms tab of the Options window. From there, you can do any of the following: Instruct Firefox not to remember form information anymore by deselecting the Save Information I Enter in Forms and the Search Bar check box. As the wording implies, if you choose this option, Firefox also stops remembering phrases you search for in the Search Box in the upper-right corner of the main Firefox window. Clear your current Saved Form Information by clicking the Clear Saved Form Data Now button. This takes place as soon as you click the button and is irreversible. Note that this doesn't turn off saved form information; it only clears the currently stored information. New form information accrues the next time you submit an online form or use the Search Box. If the Clear Saved Form Data Now button is unavailable, no form information is currently saved. Tip Saved form information doesn't include passwords you enter into online forms; those are stored separately, as I discuss in the next section.   More information about the automatic form-filling feature is available in Chapter 8. Keeping your saved passwords safe Firefox remembers passwords you use to log in to secure sites on the Internet (after asking you) so you don't need to enter them every time you log in. These are known as saved passwords, and by default, Firefox remembers them indefinitely. To configure or clear saved passwords, follow the directions in the section "Working One-on-One with Your Data," earlier in this chapter, to get to the Passwords tab of the Options window. From there, you can do any of the following: Instruct Firefox not to remember passwords anymore, by deselecting the Remember Passwords check box. Set, change, or remove a Master Password. If family members or co-workers share your computer, you might find it disconcerting that Firefox automatically prefills your passwords for them. On the other hand, the feature is convenient when you are at your computer. Firefox offers a feature called Master Password