In Firefox to make Yahoo your homepage you can navigate to Yahoo and then in the Firefox menu click on “Tools”, then “Options”. Next click on the “General” tab and then click on “Use Current Pages”. Next click “OK” at the bottom of the window. To see step by step instructions for setting your homepage in both Firefox and I.E. see here: http://www.youtube.com/watch?v=90EpVQtId2g.