Now with Google search shitting the bed, here's how to add DuckDuckGo NoAI as your default search engine in the Firefox toolbar. I'm leaving directions here because I just did it and I'm not techy so it took me a few minutes to puzzle it out.
In Firefox, from the 3 bars on the left, go to settings. Click Search. Scroll down the page and click on the "Add" button under the box of choices.
A box will popup. For the search engine name I put "DDG no AI" but you can put whatever you want, just so you know what it is. For the URL put
https://noai.duckduckgo.com/%s
Click "Save Engine" and the popup will close.
Scroll to the top. From the drop-down menu under "Default search engine" select "DDG no AI" or whatever you named it. Done!