pls help me Rated 5 out of 5 stars

finally i found what i search for in this addon But unfortunately i don't understand how i can use it
(i don't understand middle-clicking mouse means)
my mouse has left click and other right and scroll

pls explain me in detailed how to use it Because when i open bookmark menu and select an item and open it (by click on left mouse click as usual) it open in new tab and the menu disappear

please help me rapidly and simply

This review is for a previous version of the add-on (1.2). 

re: pls help me

Most mice have a left button, a right button, and a clickable scroll wheel in the middle. Middle-clicking refers to clicking (pressing and releasing) that scroll wheel in the middle. Update: Problem with system-wide mouse setting - resolved via email.