Excellent Rated 5 out of 5 stars
This is a great add-on! I've been wanting to be able to hide the QuickFilter bar ever since I started using Thunderbird, but I didn't want to lose the QuickFilter search box. Now I can hide the bar AND keep the search box! Any and all of the elements of the Quickfilter bar can be freely moved to other toolbars.
Also, this add-on is surprisingly feature-rich and bug-free for a 1.0 release. Good job by the developer!