Welcome to Firefox for Android Add-ons.
Add extra features and styles to make Firefox for Android your own.
CloseReview for Extra Folder Columns by Franks
Rated 5 out of 5 stars
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.
To create your own collections, you must have a Mozilla Add-ons account.