Rated 5 out of 5 stars

Thanks a lot, Anton! I’d always feel annoyed by websites forcing to open a new window. At least, thanks to Firefox it was merely an »open in new tab« but still I don’t like this behavior. Now with your »open here« command it’s history!
Especially beautiful is the additional setting to group all »open in« commands into one contect folder, that’s smart, too! I would even love to have this very same functionality added to my left klick on links. (Do not even know if that’s possible at all ... Is it?)
Anyhow, thank you deeply.

This review is for a previous version of the add-on (1.7.1). 

Hi Mateo, thanks for your comments! Sorry, I don't know of any way to force Firefox to open links in the current tab when you left-click, neither via an Options (about:config) preference, nor using a keyboard shortcut. You might find it useful to know in advance whether a link is going to try to open in a different tab/window so that you only need use the "Open link here" option when necessary: see http://forums.mozillazine.org/viewtopic.php?f=19&t=118365&start=45#p1952435