Firefox 4 introduced the Combined Stop/Reload button, which placed a unified stop/reload button on the right side of the address bar. While it possible to uncouple the buttons and move them separated, there is no way to move the unified button to the other side of the address bar. There has been an ongoing discussion about this in the Firefox Builds Group. A Stylish script (script on userstyles.org) was created which will move the unified stop/go/reload button to the left of the address bar and keep it attached. This will work on the current Firefox 5, 6 and 7 developmental builds as well.