Middle mouse button closing tab

There are already a couple of posts about this, but they were closed during a maintenance run it says.

The request for me is very isolated: if I middle mouse click on a browser tab, it closes. I don't have to target exactly the x icon to close the tab. I would like to see the same with Capacities, where you can middle mouse click to close it.

Others also mention about opening a new tab when you click a link. This would be nice, but for me is a separate feature request that I think is already there.