It takes approx. 5 seconds to add a new search engine to Safari on macOS.
What?
What?
But let's try it. Go to Safari > Preferences > Search and choose the "Search engine" dropdown, and you'll see you have a dropdown with only five options.
Google reportedly pays $15B per year for that top spot.
Though, I couldn't add a keyword to your site in firefox with its "Add a keyword" feature. Might be due to the javascript calling some url behind the screen.