IT WORKS!!

Thank you. So far, this is working.

I've been using this for years in Windows and I'm very happy with the long left-click especially and making it change to the new tab immediately.
Since I changed to Linux (Mint Cinnamon) I notice a strange behaviour. When I return to the page I left the whole page background is "glued to the mouse pointer" and moves with it until I make a single click and normality is returned.
It's a small thing but a bit annoying.

Great extension, works just as described, although I would suggest adding support for opening links from the bookmark bar!