On the messenger and message window elements we have had the attributes titlemodifier and titlemenuseparator for quite a while. We don't currently use them, but I think we should - as this enables us to do some build hacks to expand the title (bug 481374) for alpha/beta releases, and allows extensions to tweak things as well (e.g. nightly tester tools). Simple patch applied to switch over, I've tested on Linux and Mac and everything looks fine. For the case of a tab with no title, I used the following in the error console to get one to open with about:blank : Components.classes['@mozilla.org/appshell/window-mediator;1'].getService(Components.interfaces.nsIWindowMediator).getMostRecentWindow("mail:3pane").document.getElementById("tabmail").openTab("contentTab", {contentPage: "about:blank"}); I'm trying to get this in before b3 as we'd like it for bug 481374 (neither of which are blocking, but bug 481374 reduces the work build automation has to do and therefore would be nice to get in for b3 so we can test them together).

Comment on attachment 386833 [details] [diff] [review] The fix Looks good to me! r=mkmelin

Checked in: http://hg.mozilla.org/comm-central/rev/b444f4f57383