Firefox Home Search Page moves Focus to Address Bar

To stop Firefox moving Home Search Page text focus to the Address Bar enter about:config in the Address Bar to bring up the advanced configuration page.

Type awesomebar in the search filter box to bring up the following variable

browser.newtabpage.activity-stream.improvesearch.handoffToAwesomebar

Toggle the boolean value from True (default) to False

ref: https://www.askvg.com/fix-restore-real-working-search-box-on-new-tab-page-in-firefox-89-and-later/