Google Chrome: Open a link in new tab and switch to it in one click

There are many extensions that can open new links in an active tab (i.e., open links in a new foreground tab) with "one click."

Mouse Gesture Extensions

crxMouse Chrome Gestures

By default, click on any link and drag to the right (→) to open it in a foreground tab. You can configure this gesture on the "Super Drag" tab of the extension's Options page.
Gestures for Google Chrome™

Enable the "Super Drag(Drag&Drop Action)" option on the "Basics" tab of the extension's Options page. You can then open new foreground tabs by clicking on links and dragging downward. To change or configure this gesture, go to the "Drag Actions" tab on the Options page (only visible after enabling the "Super Drag(Drag&Drop Action)" option).
smartUp Gestures

By default, click on any link and drag to the right (→) to open it in a foreground tab. To show visual feedback when dragging the link, enable the "Super Drag" feature by going to General → Features ON on the extension's Options page. You can configure the gesture by going to Simple Drag → Link Actions, or Super Drag → Link Actions (if you enabled Super Drag), on the Options page.
Smooth Gestures Plus

Paid app with free trial period. By default, right-click on any link and drag upward (↑) to open it in a foreground tab. To make this a left-click drag instead, go to Settings → Mouse Button to Start Gesture on the extension's Options page.

Long Press New Tab

Allows opening new foreground tabs via "long-clicking", i.e., by clicking and holding down the mouse button on a link for a small amount of time. On the extension's Options page, you can enable long-clicking for the middle and right mouse buttons. You can even enable "Super Drag" to open links in the foreground by dragging them, making this extension a potential substitute for the mouse gesture ones.
Right Click Opens Link in New Tab

Allows right- or middle-clicking to open links in foreground tabs. By default, right click opens a link in a foreground tab, and middle-click opens a link in a background tab. You can configure this on the extension's Options page.
Click to Tab

Can open all links in new foreground tabs without gestures. To enable this behavior, uncheck the "Open in background" box on the extension's Options page.

On MacOS, it's Cmd + Shift + Click.