Other browsers like Opera, Chrome, or IE let you duplicate tabs with the built-in functionality, and while there are plenty of Firefox extensions that provide this feature, if this is the only feature you want this might be the extension for you.
If you ever need to duplicate a tab in Firefox for some reason (i.e. e-mail) then you have to do it the hard way by manually opening a new tab and navigating to the desired webpage.
Duplication gets much easier to do once you add the extension to Firefox. Everything that you need is available in the context menu…choose the action that you need to perform and enjoy the simplicity.
Merging windows will be just as simple and quick.
There are a surprising number of options available for what seems to be a simple extension. Enable or disable setting to optimize the extension’s performance on your system.
The Duplicate This Tab extension provides a nice solution for anyone that has wanted the ability to duplicate tabs in Firefox.