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http://support.mozilla.com/en-US/kb/Options+window?style_mode=inproduct#privacy_optionsFirefox 2:
* Remember visited pages for the last ... days: Here you can specify how long you want Firefox to remember what pages you have visited. The default is 9 days.
Firefox 2
Firefox 3:
* Keep my history for at least ... days: Here you can specify how long you want Firefox to remember what pages you have visited. The default is 90 days.
Firefox 3
* Remember what I enter in forms and the search bar: When you enter information in web forms or the search bar in Firefox, that information is saved so that Firefox can give suggestions when you enter information in forms in the future. To stop this behavior, uncheck this option preference. * Remember what I've downloaded: This option preference controls whether or not past downloads show up in the Downloads window. The Downloads window (accessible from Tools or by pressing CtrlCmd+J CtrlCmd+Y) displays a list of your recent downloads. Downloads options preferences are available in the Main panel.