Most people do one of two things: (1) move the mouse up to the new tab, click it, and then move it back down to the main page or (2) momentarily shift their m

Most people do one of two things: (1) move the mouse up to the new tab, click it, and then move it back down to the main page or (2) momentarily shift their mouse hand over to the keyboard and press a shortcut that moves browser tabs. Or (3): use your left hand to perform the shortcut. That's why it's sometimes convenient to have passwords that only require your left hand (though only for unimportant websites). Having mouse shortcuts is not a bad idea per se, but having tried some of these mouses, I always end up clicking accidentally random buttons, especially the small sensitive ones located under the thumb.