If you want to have a firefox tab opened with some content and want to make a duplicate (copy) of that or you may want to have same content loaded in two firefox windows with multiple tabs open. You can not do so manually as it takes long times to open a new browser windows, opening new tabs and copying URLs from first windows tabs to others. Firefox has an easy solution for you for these kind of task and that is a plugin called ‘Duplicate This Tab‘.

Duplicate This Tab is an addon that enables you to detach a tab from one Firefox window and load it up in a new one and keep the tab loaded up in the old Firefox window. The main feature of this extension is that it keeps that same web page loaded in the older Firefox browsing window too, rather than just moving it to the new Firefox window.
Other options include
- duplicate tabs
- duplicate tabs into new windows
- Detach tabs
- Merge windows
Get ‘Duplicate this Tab’ from this link
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