From the bug report , which also has a screen shot mock up "This would make it easier to identify the folders of diffrent mail accounts. This would also make sense for the top account nodes."
Lots of good suggestions here. Unfortunately they probably don't get picked up by other users because this is more of a meta-suggestion, with multiple items in one idea instead of one item per idea . See https://connect.mozilla.org/t5/ideas/ideas-gu...
I've been in touch with the development team. Planning has completed for this, and work is actually well in progress. Look forward to this being delivered.
