How to enable the Unified Search Button & other search improvements in Firefox 137?

[firebird]

I just updated to Firefox 137 and want to try out the new search features mentioned here: https://www.mozilla.org/en-US/firefox/137.0/releasenotes/

But I don't know how to do it. I know I can enable Tab Groups in about:config but how do I do that for the search features?

Thanks!

I thought it would also be good to have a thread to discuss the search features, so this thread doubles as that!

[Agentvirtuel · Accepted solution]

Hello

Is it browser.urlbar.scotchBonnet.enableOverride https://connect.mozilla.org/t5/discussions/address-bar-updates-now-live-in-firefox-nightly/m-p/77151...

[Agentvirtuel]

Hello

For information purposes.
About Studies https://support.mozilla.org/en-US/kb/shield