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I don't want to be able to drag tabs away from Firefox to produce another instance. I'd like the old behaviour of dragging a tab into explorer to produce a URL shortcut.

I've tried the Disable Tab Tearing add-on but it doesn't seem to work for me - dragged tabs still produce a new Firefox instance.

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up vote 0 down vote accepted

There should be an about:config option to disable this, but apparently there isn't.

But the add-on works for me, on Firefox 3.6.
You need to go to Tools > Add-ons and pick the options for the extension, then click the check-box in the dialog.

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This does indeed work, but not if you use Tree Style Tab ( :( – Umber Ferrule Feb 13 '10 at 18:48

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