Internet Explorer 9 comes with the option of making a duplicate tab. What this means is that the current website or webpage loaded can be opened in another tab thereby making multiple tabs of the same webpage / website.
Here is how to do it :
1. Right click on the tab whose duplicate tab needs to be created and select “Duplicate tab”.
2. It will now open the same webpage/website in another tab.
This feature can come in handy when making changes to a website so that one tab can display the before version and the other the after version.