Right click a blank part of the Tab bar and click "Navigation Bar".

The Home button is located on the right hand side of the Search engine bar.

To make FF4 look like FF3, do the following

• Right click a blank part of the tab bar and click "Tabs on top" to remove the checkmark. Tabs will subsequently reappear below the search bar.
  
  
• Repeat the same steps, but click the top one called "Menu bar". This will reinstate the text links at the top.
  
  
• To rearrange the layout, repeat the same steps again and choose "Customize". A panel will open and while that remains onscreen, you can move elements like toolbars, buttons etc around and place them anywhere you wish. You can also drag anything you don't like into that panel and add anything you want by dragging it out of there. You may possibly find the Search Engine bar in there if that's what you were referring to. If so, drag it out.
  
  
• To replace the status bar at the foot of the page, install this add-on: https://addons.mozilla.org/en-US/firefox/addon/status-4-evar/
  
  

If the menu bar is hidden then press the F10 key or hold down the Alt key, that should make the menu bar appear.

Make sure that all the toolbars like the "Navigation Toolbar" and the "Bookmarks Toolbar" are visible: "View > Toolbars"

• If items are missing then open the Customize window via "View > Toolbars > Customize" or via "Firefox > Options > Toolbar Layout"
• If a missing item is in the toolbar palette then drag it back from the Customize window on the toolbar
• If you do not see an item on a toolbar and in the toolbar palette then click the "Restore Default Set" button to restore the default toolbar set up.

See also:

• http://kb.mozillazine.org/Toolbar_customization