Start '''[https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode Firefox in Safe Mode]''' {web Link} by holding down the '''<Shift><br> ''(Mac Options)'' ''' key, and then starting Firefox. Is the problem still there? While still in Safe Mode, Type '''about:preferences#general'''<enter> in the address bar. There are two settings; * '''When Firefox Starts''' When the browser is started, what do you want to display. Many of us choose '''Show My Home Page.''' * '''Home Page''' When a new page is opened, what do you want displayed. # '''Use Current Page'''. Use what ever page(s) are open at that time. # '''Use Bookmark''' # '''Restore To Default.''' about:home shows a Mozilla home page with tools. You can use any of these that you wish; '''about:home''' (Firefox default home page), '''about:newtab''' (shows the sites most visited), '''about:blank''' (a blank page), or you can enter any '''web page''' or '''about:''' page you want.