Comment 233 for bug 52667

(From update of attachment 366330)
There seems to be at least of cases where this doesn't do what it should.
 o newsgroups (all you can do is "reply")
 o lists, and when I'm bcc:ed I think

The only case when "All" shouldn't be needed is when it's addressed exactly to me, no?

>+function UpdateReplyButtons(aUrl)

You don't use the aUrl

>+{
>+ let msgHdr = msgHdrForCurrentMessage();
>+ let showReplyAll = msgHdr && (msgHdr.recipients.split(",").length > 1 ||
>+ msgHdr.ccList);

  let showReplyAll = msgHdr && (msgHdr.recipients.split(",").length > 1 ||
                                msgHdr.ccList);