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Rated 5 out of 5 stars
Great - a much needed hack for those of us who need the freedom and flexibility that multiple-window browsing offers. (Such as viewing pages side-by-side, flipping between many windows with Alt-Tab, etc.) Tab Killer is the only game in town, for what should have been a simple checkbox in Firefox (like it is in IE7).
Only problem - when closing a Firefox window (3.05), the tab bar on all other open Firefox windows flashes momentarily. Perhaps a fix is due?
Otherwise, Tab Killer is a terrific and essential extension!