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Firefox window with multiple open tabs disappeared.

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Firefox window with multiple open tabs disappeared and I can't find it. I clicked "new window"which opens and is blank: history still shows the many sites I've visited, but I want to get the missing/hiding window back. Can this be done? Kindly help.

Firefox window with multiple open tabs disappeared and I can't find it. I clicked "new window"which opens and is blank: history still shows the many sites I've visited, but I want to get the missing/hiding window back. Can this be done? Kindly help.

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Continuing info re: missing tabs. Using MacBook Pro; not sure which version IOS