I've had the option to use the address bar as search set in Mozilla products for as long as it's been an option (so like 20 years?) and it's only in the last 2

I've had the option to use the address bar as search set in Mozilla products for as long as it's been an option (so like 20 years?) and it's only in the last 2 or 3 years that it's become unreliable.