Great, but a strange bug: Rated 4 out of 5 stars

Really cool add-on, it's actually all I wanted. It's cool that you can choose whether you want the progress in the address bar to be up, down or right in the middle of the bar. BUT: As soon as I installed the add-on "locationbar²" for Firefox 4, I discovered no matter which I choose (up, down or middle), it's always shown in the middle so that it fills the whole address bar. When I deactivate locationbar², it's alright again. But as soon as I activate it, I can't choose the progress to be up or down the bar again. That sucks a little bit as I wanted them both and I hate the progress to fill up all the address bar! Not THAT important, though ;-)

This review is for a previous version of the add-on (2011.01.17.02.4). 

S4E and Locationbar² are not compatible.