When I open my Yahoo mail account, it comes up with lines between every entry. When I try to send a new message, the dialogue box is incomplete. The tool bar above the message box is empty so I cannot change the font or font size, etc.

See: * http://kb.mozillazine.org/Website_colors_are_wrong * http://kb.mozillazine.org/Websites_look_wrong ---- * "Clear the Cache": Tools > Options > Advanced > Network > Offline Storage (Cache): "Clear Now" * "Remove the Cookies" from sites that cause problems: Tools > Options > Privacy > Cookies: "Show Cookies" Start Firefox in [[Safe Mode]] to check if one of the add-ons is causing the problem (switch to the DEFAULT theme: Tools > Add-ons > Themes). * Don't make any changes on the Safe mode start window. See: * [[Troubleshooting extensions and themes]]