Works, but doesn't follow Firefox standards Rated 4 out of 5 stars
Should open in current tab if left-clicked, or in new tab if Ctrl+Clicked or Middle-clicked. Currently offers a setting for new/background tab, but I pick one or the other based on various factors, like whether I need the current tab again or not.
(looking forward to your improvement, +1 - will give 5 once it works consistently! I did see the setting, I just pasted the same review for the other addon that does this, which didn't have the setting)
There is a option i n"Preferences" of the addon to specify if tab opens in background or foreground.
I will implement you suggestion to open in background when middle clicked, in the upcoming version.