Rated 5 out of 5 stars

Perfect. Thanks for keeping TBird first-class. This capability is important to me. BTW: Finding this add-on was a bit tricky - my typical TBird Add-on searches didn't display it. Web searches did. Strange.

This review is for a previous version of the add-on ( 

This is due to the fact that Mozilla actively prevents users from finding addons that do not pass a so-called "full review". A full review requires an add-on to not trigger compatibility issues, and moving a toolbar has tons of possible issues. Thus, this add-on is marked as experimental (which is a good thing, as it indeed is likely to break stuff) and not available for in-application searching (which is imho a bad thing, but I guess we can be happy that Mozilla permits such add-ons at all).