You can modify this via "Remember search and form history". *Settings -> Privacy & Security<br>Firefox will: "Use custom settings for history" *https://support.mozilla.org/en-US/kb/control-whether-firefox-automatically-fills-forms You can use these steps to remove saved items from an autocomplete drop-down list. #click the (empty) input field on the webpage to open the drop-down list #highlight an entry in the drop-down list with cursor Down key<br>do not hover or click the mouse or press the Enter key #press "Delete" or "Shift+Delete" to delete the highlighted entry