Hey, thanks so much for the kind words, and good catch! That one slipped through, a bug with how the search API was wired up, so the box ended up hardcoded to Google instead of using your default engine.

Good news, Mozilla just approved v12.7.1 and you should get the update soon. The search now respects whatever default engine you've set in Firefox preferences (DuckDuckGo, Bing, anything custom).

Really appreciate you flagging it, and yeah, total labor of love. Glad you noticed.