There is a URL saved in my browser which is really annoying, because it prevents me from autocomplete another URL that I visit far more often.
According to this docs one only has to click on the suggestion, and then press shift+delete to remove it. This would help so much.
However, when I press shift and delete, nothing happens. I have a German keyboard, this is what I press:
I also found a question from 2013 How to remove typed-in URLs from browser history in Firefox? but the links in the answer don't work, and installing an SQLiteManager seems maybe not the best solution in 2019 to this.