Fixed Font in GMail.

[This receipt is not working anymore because of recent GMail changes.] If you're using a Firefox browser you can have a standard fixed-font non-rich-edit view and edit look. Here is my last minimal personal style sheet. Edit your userContent.css. In Microsoft Windows is under under your "Documents and Settings" directory "Program Data\Mozilla\Firefox\Profiles\{some hexa code}.default\chrome"

@-moz-document domain(mail.google.com) {
   font[size="-1"] /* print view    */,
   .mb             /* message body  */,
   .tb             /* edit msg body */ {
       font-family: monospace !important;
       font-size: 10pt !important;
       width: 700px !important;
   }
}

Original code from http://milov.nl/2608 and his commenters.