Hello, I am trying to add new search engine to my Firefox Nightly. On the mobile I only had to add the search engine link+string. By having this, I could have both duckduckgo.com and safe.duckduckgo.com as my search engines. I would like to add safe.duckduckgo.com to my desktop firefox, as well. However, the adding method which uses search engine's link is not present. Any ideas how can I add this search engine? Thank you