Rated 5 out of 5 stars

le Franks ar Iúil 7, 2015 · buan-nasc

Yes, Extra Folder Columns is built in now, but in order to enable it you must modify with config editor the key

mail.folderpane.showColumns and set to true

ARB suggests to go to Options -> Layout -> click Folder Pane Columns but the option does not exist.