Rated 5 out of 5 stars
This has been an indispensible tool for me for quite some time now. Just the other day, I noticed that I can't duplicate (or "copy") the search engines within the list. If I press CTRL + left mouse button and move the mouse, that little plus sign [+] (indicating duplicating instead of just moving) below the mouse pointer indeed appears, but it doesn't duplicate or copy the link and only "moves" it within the search engines list.
Copying (instead of just moving) the link would be useful if you have different folders that you like to open via the "Open All in Tabs" command and some folders should have the same SE as some other folder.