window.frames["foobar"] doesn't work. STR: Start SeaMonkey. Open a MailNews window. Look at the Error Console output: Sun Mar 17 2013 23:32:45 Error: TypeError: window.frames.accountCentralPane is undefined Source file: chrome://messenger/content/tabmail.js Line: 893 Relevant code in tabmail.js: window.frames["accountCentralPane"].location.href = acctCentralPage;
To be precise, it looks like it was this changeset specifically that regressed this: http://hg.mozilla.org/mozilla-central/rev/27d4aafb847d
(and this also affects Thunderbird to the point where we can't use it unless we work around this or fix it).
Fixing this in bug 823227.