I think that's rare: usually the middle-click works reliably and only the Ctrl+left-click is overridden (typically by a script attached to the link).

Does right-click > Open Link in New Tab work, or have the same problem?

If there's no built-in solution, you might be able to find an extension or Greasemonkey user script that strips the script handler off of the links.

The site also abducts the right click menu (opens the link)

What script would you suggest ?

- The add-on "Right to click" breaks many functionalities (like hover action) - The add-on "Controle de scripts" (the most popular out there) does nothing

And of course, Mozilla, doing their part on ruining my day, made the unexplainably stupid decision of removing script controls from the "content" page on the FF options, since FF26

I don't have an immediate suggestion since various sites use different techniques.

And the advanced script settings were removed in Firefox 23, not Firefox 26. For corresponding entries in about:config, see: https://support.mozilla.org/questions/967108#answer-464407