I know it’s been getting worse over time, but I could still find what I needed after some digging.
Recently it’s been like 10 minutes of adjusting search terms, still getting completely useless or irrelevant results, and me just giving up afterwards. Other search engines seem just as bad.
This is correct (your screen). Now go to your Firefox Settings, click on Search on the left side, scroll down to the Search Shortcuts section and below that box is a button labeled Add. You will get a box to add a search engine, the Alias field is optional. Make sure after you add it, there is a blue check in front of it on the list in the box or it’s invisible.