How do i delete a search/URL from my Firefox address bar?

my brother searched something inappropriate and whenever i type p in the address bar porn-Google search pops up, what can i do to permanently remove this?|||You can either go to tools-%26gt;options-%26gt;privacy and delete the history completely, or if you don't want to clear the whole history, next time it shows up, select it using the down arrow and then press the Delete key.|||click on the address bar and click down and then the delete button.. also click on history in the toolbar and click show all history and delete all the history|||Have you tried going into the Firefox tab (at the top left area usually) Tools -%26gt; Options -%26gt; Privacy and then clear your recent history?|||Highlight the bad address, press delete.|||Hit CTRL + SHIFT + DELETE and choose to clear Everything.