httpjames I am in Europe and as said I do have the new "choice" screen. Firefox is just not one of the options.
This is the full list of "search engine apps" that are available in the choice screen:
- DuckDuckGo
- Ecosia
- Brave
- Microsoft Bing
- Google
- Qwant
- PrivacyWall
- KARMA
- Yahoo Search
- WWF Panda Search
- You.com
- OceanHero
Apps need to apply to be included in Google's list, and there's even a feature request in Mozilla's forums for it:
https://connect.mozilla.org/t5/ideas/apply-for-the-android-search-engine-selector-screen/idi-p/53500
So I'm surprised that @silvenga was able to do that.
Are you maybe confusing the search engine choice screen with the default assistant app? Firefox does show up as an option when choosing the default assistant, but I think that was introduced in the Android 8 days when long pressing the Home button would open a search with your assistant. I think that's pretty much useless now that we've moved to gesture navigation and the search widget no longer triggers your assistant.