Firefox

• 1). Open the Start menu and type "firefox." Select "Mozilla Firefox" from the list of results.
  
  
• 2). Right-click an area of the interface directly above or below the YouTube URL. Do not right-click the contents of the web page, but rather the navigation bar itself.
  
  
• 3). Remove the check mark next to "Navigation Toolbar" to hide the YouTube URL. Right-click the top "File" toolbar and return the check mark to restore it.
  
  

Opera

• 1). Open the Start menu and type "opera." Click "Opera" from the results list.
  
  
• 2). Click "View," then "Toolbars."
  
  
• 3). Click "Address Bar" to remove the URL bar. Repeat this process to re-enable it.