Review for Folder Pane View Switcher by Tom LB
Rated 5 out of 5 stars
Hate having to click through two levels of pull-down menus every time you want to switch from All Folders to Favorites or Unified views? This add-on elegantly solves the problem, giving instant access to the folder view options.
Other reviewers have asked for tabs instead of (or in addition to) arrows, but I think it is perfect as-is. Arrows occupy less real estate on the UI, and since navigation wraps around (Recent to All), you never click more than twice to get the view you want.
To create your own collections, you must have a Mozilla Add-ons account.