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Duplicate Tab is a Firefox Extension.

You can download it from the developer’s website or the Firefox Add-Ons site.

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This extension gives you the ability to create an exact copy of a tab (and its history).

There are several ways to duplicate a tab.

The first way is to right-click on the tab itself, and choose “Duplicate Tab”:

 

 

You’ll have two identical tabs in the same window:

 

 

You also have the option to duplicate a tab to a new window.

Finally, you can choose to “Merge Windows.” This will consolidate the tabs from all of your open windows into the same window.

There are a couple of toolbar buttons that you can use if you’d prefer not to right-click on the tabs:

 

 

There are also a bunch of tweaks available in the Options Window. Here are the screenshots: