Almost what i need, but in my latest version of FF, it doesnt work- It just bumps to the last related seraches in the bottom of the serp

Goes to related searches rather than search results

Arrow keys not working, which is the most important feature for me. I found another addon which actually works: Web Search Navigator.

The concept is great but sadly it doesn't work on my browser... I can see my arrow and tab keys locked since I can't use them anymore, but no arrow are showing up on front of any link and pressing enter doesn't do anything either. Let me know if that is something you could investigate and need anything in that regard.