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.