Mozilla's Firefox browser continued to erode Microsoft's Internet Explorer market share during November, a Web metrics company said Wednesday, even as IE 7 gained momentum.According to Net Applications, the open-source Firefox grabbed another half a percentage point of usage share last month, accounting for 13.5% of all browsers, up from October's 12.96%. Internet Explorer's share, meanwhile, fell from 81.28% to 80.56%. If current trends continue, IE will have lost 5 percentage points during 2006 and will likely dip under 80% for the first time in more than six years.    more....