Re: where is the refresh button now in this new version?
Firefox 4.0 has a combined Reload, Stop, & Go button that appears at the right end of the location bar. Only one function is ever active at any one time, so combining them save UI space was a good idea. When a page is loading, it is a "Stop" button, when it finished loading, it turns into a "Reload" button, and when you start to type something into the Location bar it turns into a "Go" button.
To restore the Firefox 3 appearance you can use these steps:
Open the "View > Toolbars > Customize" window or right-click a vacant area on a Toolbar, except fot the Bookmarks Toolbar.
Then drag'n'drop the Reload and Stop buttons to their previous position at the left side of the Location bar.
Set the order to "Reload - Stop" to get a combined "Reload/Stop" button.
Or "Reload - Stop" then put a flexible space in between the two to prevent the buttons from combining.
Set the order to "Stop - Reload" to separate them and get two distinct buttons.