
saved by56 people, first byChristian Henner-Fehr on 2008-06-17, last byPatrik Johansson on 2008-08-14

about:config into the address bar and hit Enter.browser.urlbar.maxRichResults in the Filter field to reach this preference.
While the Smart Location bar is quite intelligent, if you enter an incorrect URL—say, to a page that doesn't exist, or a parked domain—Firefox 3 will still remember it and suggest it again later. (Garbage in, garbage out, as they say.) To remove a mistyped URL from your suggestion list forever, key down to the suggestion and type Shift+Delete on the Mac, and just Delete on Windows. This trick also works for any form auto-complete entry, like if you mistype a username into a login form.about:config, set layout.spellcheckDefault value equal to 2 to enable spell-checking in single line input fields as well as textareas.about:config, set layout.spellcheckDefault value equal to 2 to enable spell-checking in single line input fields as well as textareas