text/html; mutt-html %s
#!/bin/sh
FILE=/tmp/mutt-`date +%s`.html
cp -f "$1" $FILE
firefox file://$FILE
text/html; firefox -new-tab %s; test=test -n "$DISPLAY"
I would not do that, not call firefox. It read images and pass information to the one sent you the email.where mutt-html is a script in $PATH: