Firefox new tab has a box in the middle of the page for you to click in and enter text to search in your default search engine - and it immediately starts typing in the URL bar. IF I WANTED TO USE THE URL BAR I WOULD CLICK THERE.
Throws me off every time.
It’s open source software, raise an issue/bug report if this is unexpected behavior. The community is open and responsive to feedback. Posting here won’t get it fixed.
Posting here did get it fixed for him.