Type '''about:addons'''<enter> in the address bar to open your Add-ons Manager. Hot key; '''<Control> ''(Mac=<Command>)'' <Shift> A) ''' In the Add-ons Manager, on the left, select '''Extensions. ''' Remove “ Yahoo “ '''Anything. ''' Also look for SafeSearch, SearchAssist Incognito, FileConverter Addon, SearchLock, DiscreteSearch, WebSearch, Findwide Search Engine Now do the same in the computer’s '''Programs Folder. ''' '''Windows:''' Start > Control Panel > Uninstall Programs. '''Mac:''' Open the '''Applications''' folder. '''Linux:''' Check your user manual.