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por ander el Jul. 11, 2009 · enlace permanente

In FF 3.5, you can open a duplicate tab by holding Ctrl and dragging the tab to an empty place on the tab bar. You can also open the tab in a new window by dragging it into the content area.

Mike DePetris has also released a 3.5-compatible version of this add-on, which you can find on one of the add-on's MozillaZine pages:

http://forums.mozillazine.org/viewtopic.php?f=48&t=83785&start=165

I think he's simply changed the FF version number in its script, but I've installed it and it works great.