Welcome to Firefox for Android Add-ons.
Add extra features and styles to make Firefox for Android your own.
CloseReview for Quickfile by Philipp Kewisch
Rated 5 out of 5 stars
If you are looking for a successor of this Extension, there is Nostalgy (a bunch of features aimed at keyboard navigation), or Quick Folder Move (simple move/copy only extension, probably closest to this extension).
To create your own collections, you must have a Mozilla Add-ons account.