Looking for a FireFox Add-On

3 Jan 2009
Does anyone know if an add on exists that would let me open a tab within the same active window? By that I mean rather than having each tab as a separate page, two tabbed windows could be viewed side by side so I could easily view the two pages at the same time.

If such an add on does not exist in FireFox then does anyone know if a different browser has this option?
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