Firefox supports an open search standard which is a big improvement, so that's probably where you saw this. It provides an easier experience from the nav bar to

Firefox supports an open search standard which is a big improvement, so that's probably where you saw this. It provides an easier experience from the nav bar to add a new search engine to the browser. In practice, while it's a huge improvement, I've found talking with users that it's mostly helpful if someone technical is talking them through the change.