Review for Folder Pane View Switcher by Sabbah
Rated 4 out of 5 stars
It almost solves the problem to quickly switch between your, unread, Favorite and All folders instead of going to View / Folder options.
This is something better version. but hope in future the favorite folders just stay on top rather switching and choosing options
To create your own collections, you must have a Mozilla Add-ons account.