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.

It does not work for links from the home page of the Firefox. The rest is not bad.

It would be perfect if we could prevent the context menu from opening when right clicking. The option extensions.rightlinks.showContextMenuTimeout set to -1 doesn't work for me.
FF107.0 RLW 0.5b12

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