Please add the following options to the "+" tab to Firefox to make it more comprehensive
1. New Window
2. New Private Window
3. Right click on a Container to open as a Window instead of a tab
4. Right click on "+" tab should directly open a new window with the default container for a device*, without having to select a container.
5. Left click on "+" tab should directly open a new tab with the default container for a device*, without having to select a container.
6. Hover over the "+" should bring up the Container menu. That means it will only take one click to open a new tab/window instead of the current two clicks.
In general: a Private Window is just a container, so it would be nice to unify those two concepts.
* On a somewhat related note, you should be able to set a default container for a device. For example, on my work computer, I want my default container to be Work and on my home computer, so I don't have to select containers ever time I open a new tab.
Finally, containers should be in the same order, regardless of the device you're on. It seems to be random, which make you have to think about it too much.