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Undo close tab doesn't work as it works in 'Default New Private Window' of Firefox. I think each 'Private Tab' is a 'New Private Window' in itself. Anyway the undo tab history can be mantain until atleast one 'Private Tab' is open like sharing memory, info between different tabs open with 'Private Tab'?

这个评论是针对附加组件的一个早期版本的(0.1.5.1-signed)。 

See my reply here:
http://forums.mozillazine.org/viewtopic.php?p=13153895#p13153895