"Open in new tab" should be default behaviour
By click on collection this should be opened in new tab. If the collection is already opened the tab will be selected. The context menu "Open in new tab" should be stay as is and opend a collection in new tab.
The case "why" - you open a collection, put some filter, order and some other staff. Then you want check other collection and just click on it. All settings on the first collection are lost.