About User Agent Switcher : The User Agent Switcher extension adds a menu and a toolbar button to switch the user agent of a browser.
After adding the User Agent Switcher Add-on to your Firefox. Save the attached “useragentswitcher.xml” to your local machine and do the below steps to experience variety of user agents in your Firefox browser.
Step#1: Go to – Tools -> Default User Agent -> Edit User Agent
Step#2: Click “import” button to add the xml
Step#3: select “useragentswitcher.xml” and click “open” button and click “Ok” button in “User Agent Switcher Option” dialog box
Step#4: Restart the browser.
Set the user Agent by selecting from the list and refresh the page. Sure, YOU WILL EXPERIENCE THE DIFFERENCE.