Move Tree to new window

[hsantanna]

Firefox haves a menu option to "Move to new window", which moves only the selected tab to a new window.

There is a case where all tabs in a tree belongs to the same subject and it could go together to a new window.

So, a suggest a new menu option to "Move Tree to new window", in a way that a new window is created and all tabs from that specific tree gets moved to the new window.