In Firefox web browser, about:config provides a powerful way to configure and change the advanced preferences and settings of Firefox. Editing advanced preferences of Firefox through about:config page is easy and flexible, but it also prone to error, including possibility of creating a new preference name. The new preference name, valid or invalid, may be created inadvertently or unintentionally. However, within about:config page, Firefox does … Continue reading How to Delete Entry or Item from Firefox about:config Preferences