Rated 4 out of 5 stars
My favorite extension - thanks for being so versatile and up-to-date! I've been using PrefBar for years on Firefox, K-meleon and Seamonkey.
A small nag in FF 4 Beta 7: Whenever I have customized my Firefox toolbar layout, PrefBar appears to want to load all its unused buttons and options. All is well again after I restart Firefox.