Fixed-width fonts for Gmail in Firefox

gistfile1.txt

Since Gmail discontinued the "Fixed-width fonts" lab, here's a CSS hack to use a
monospace font for incoming mail:

1. Install the dotjs extension:

https://addons.mozilla.org/en-US/firefox/addon/dotjs/

2. Put this in ~/.css/mail.google.com.css:

/* Read messages in fixed-width font */
.ii.gt {
  font-family: "Bitstream Vera Sans Mono";
  font-size: 8pt;
}