Can't be sure if it will work 100% for every site but so far so good. Great fix for an issue that shouldn't exist.

Honestly I'm baffled that Firefox is capable of overriding link scripts with middle click but allows them with ctrl click. All these sites do is turn it into a regular left click, so they aren't adding anything, only stripping functionality from the user.
Your site has some fancy unique functionality? Cool, I'll use it if I want to use it, don't force me to.