Although there have already been any number of updates to this appalling software, nothing has yet been done to deal with its utter dysfunctionality. For example: a) clicking on notifications for new messages will always summon up various totally unrelated old messages alongside the new ones -- why??; b) when reviewing a thread of messages, you can delete only the first one; once you've got rid of that first message, you can't carry on deleting consecutive messages -- you have to close the window and start again. For heaven's sake, Mozilla, let users uninstall this 'SuperNova' and re-install the old version, which was streets ahead of this mess!
