I've created a meta bug to keep track of all the mailnews front end accessibility issues. Please don't attach patches to this bug, but instead file bug and attach the patches to them, then mark them blocking bugs of this bug.
I've already have a patch that fixes all of the mailnews pref dialogs (wrt accessibility). I'll be creating a bug and attaching my patch there. http://bugzilla.mozilla.org/show_bug.cgi?id=154249 - META bug for Mailnews Front End accessibility
