How to get individual language versions of wikipeadia in search bar?

I want wikipedia (english), wikipedia (deutsch), wikipedia (danish) etc. as individual search engines in the search bar. Earlier this was no problem. I just visited the search enbgine inquestion and clicked 'add to search bar' or something like that. But in recent versions of Firefox I can no longer do that. Is there a way? I can't find invidual add-ons for specific language versions of wikipedia. I need to be able to search multiple versions for wikipedia content.