> Is the underlining a bug or a feature?
Feature.
> And if it's a feature, is there a
> pref or something to get rid of it?
If you open up the classic.jar file in your chrome directory, look for
the file called threadPane.css, you should see this near the top:
/* on a collapsed thread, if the top level message is read, but the
thread has
* unread children, underline the text. 4.x mac did this, very slick
*/
outlinerchildren:-moz-outliner-cell-text(container, closed, hasUnread,
read) {
text-decoration: underline;
}
You may be able to modify this by making a user stylesheet but I dunno.
Anyways, just set it to
text-decoration: none;
or remove the section from the css all together.