In Firefox 4 by default the Stop, Go and Reload buttons are combined and attached to the right hand edge of the location bar. When you are typing in the location bar it will show the Go button. When a site is loading it shows the Stop button. At other times it shows the Reload button. If you want separate buttons, right-click on a toolbar and choose Customize, you can then drag and drop the stop or reload buttons and place them elsewhere. If you place them in the order "Reload-Stop" on the right hand edge of the location bar they will be combined again. For more details on customizing the toolbar see https://support.mozilla.com/kb/How+to+customize+the+toolbar ------- For the urls not showing in the address bar, there are a couple of possible causes. That can be caused by using an add-on that is not compatible with Firefox 4. For details of how to troubleshoot this to find out what one is causing the problem see https://support.mozilla.com/kb/Troubleshooting+extensions+and+themes Another possibility is the file that stores details of browsing history and bookmarks is damaged. For details on how to fix that see Locked or damaged places.sqlite - MozillaZine Knowledge Base - http://kb.mozillazine.org/Locked_or_damaged_places.sqlite I would first check for an incompatible add-on.