interface _DuplicateDuplicateProperties {
    active?: boolean;
    index?: number;
}
Index
active?: boolean

Whether the tab should become the active tab in the window. Does not affect whether the window is focused (see windows.update). Defaults to true.

index?: number

The position the new tab should take in the window. The provided value will be clamped to between zero and the number of tabs in the window.