I have used Firefox for years. I bought a new Dell Laptop 3 weeks ago, came with Internet Explorer. I later downloaded FF 6.0.1, which I prefer. After a few days of normal use, the log in page of Yahoo mail came up in very tiny letters and images- unreadable. I went to Firefox Options, again Options, then Content. All the fonts were at least 14. I unchecked the option to let web sites chose their own fonts but still get very tiny sign in page. When I copy and past the Yahoo mail URL into Internet explorer, the Yahoo sign in page is normal in size. I uninstalled FF 6.0.1 and downloaded FF 7.0.1 but that gave the same microscopic text. Thanks for any help. Paul